Gut Health, Immunity and Microbiome

At first glance the digestive system appears to have a very simple task of taking in food, digesting it, absorbing nutrients, and then excreting the waste, and while everything is in good working order, we never even give it a second thought. 

It is in fact an incredibly complex structure with a vast number of tasks to undertake. The more the gut is studied the more we realise the vital role it plays in achieving optimum health, disease prevention, and stabilising our emotional state.

Although the teeth are needed to some extent to bite, crush and tear off food the actual process of digestion doesn`t start until it reaches the stomach. With no digestive enzymes in the saliva to kick start it off, the food needs to quickly get where the real work begins, which is in the stomach.

 Oesophagus:

Is a long muscular tube that runs down the neck, passes through the diaphragm and uses strong contractions to push food directly into the stomach.  

 Stomach:

The stomach lies at the front of the abdominal cavity, tucked just behind the liver and acts like a big mixing bowl.  

Any incoming food is first subjected to an acid bath of around ph1, this immediately gets to work breaking down protein and also killing any harmful bacteria.

The walls of the stomach are lined with a thick mucous which provides protection from the strong acid as well as stopping the stomach from literally digesting itself.

As the stomach expands with food, a peptide hormone called gastrin is released, which in turn triggers more hydrochloric acid and digestive enzyme production.

To aid digestion even further the surface of the stomach is a mass of wrinkles and folds which expand and contract to grab food particles and perform a churning or chewing-like action.

At this point, the thick soup-like constancy of partly digested food and secretions is known as chyme.

The food has now been in the dogs stomach for anywhere between five and ten hours and its next destination is the duodenum, the first section of the small intestine.

 Pancreas

The pancreas is a small gland, which sits next to the stomach and is attached to the small intestine, here it transports digestive enzymes through two excretory ducts into the duodenum.

The enzymes it produces are amylase to help digest starch, lipase to digest fats and trypsin and chymotrypsin to deal with the protein.

Enzymes are needed to break down food into tiny molecules and allow the absorption of nutrients into the cells of the intestines which then go on to be released into the bloodstream. 

It also produces and secretes the hormones insulin and glucagon that regulate blood sugar levels. The higher the concentration of sugar in the diet the more insulin is secreted into the bloodstream and the harder the pancreas has to work.

Liver

The liver is the largest gland in the body and the only organ that has the potential to regenerate after disease or injury.

Its many crucial jobs include producing bile to assist the small intestine in breaking down and absorbing fats and to process the nutrients that are absorbed by the small intestine.

Its other roles include storing vitamins and minerals, acting as a filter for toxins in the bloodstream and as a glycogen store for when extra energy is needed. 

 Small intestine

The small intestine is made up of three sections, Duodenum, Jejunum (longest) and the ileum (shortest)

On receiving the nutrient-rich chyme from the stomach, it is joined by secretions from the liver, gallbladder and pancreas to further assist in the digestion process.

The small intestine is lined with millions of tiny finger like projections called the Villi, these act to increase the surface area in order to trap and absorb as many nutrients as possible.

Most of the absorption of nutrients takes place in the small intestine, which are then released into the bloodstream to travel throughout the body to be utilised by the cells.

The final and shortest part of the small intestine is called the Ileum, here the food gets broken down even further in preparation to enter the cecum, the first section of the large intestine.

 Large intestine :

The large intestine is made up of the cecum, colon and rectum.

Its purpose is to remove water from the faeces, keep electrolytes in balance and to prepare and temporarily store any indigestible matter for excretion.

But there is much more activity going on in the colon than just that and although not a very glamorous area of interest, it does deserve our full care and attention.

The large intestine has a high concentration of bacteria referred to as the

Microbiome.

This is a collection of microbes made up of bacteria, viruses and fungi that we all have in our gut for efficient digestion, absorption of vital nutrients and to build a strong immune system.

 Our dogs would have acquired their unique bugs from their mother at birth and developed others depending on the environment they lived in and the food they ate.

The delicate balance of the microbiome can easily be disrupted by medication such as antibiotics, periods of stress and anxiety and a poor, unsuitable diet.

When everything is in balance these good bugs work hard to extract as much nutrition as possible out of the food that is consumed and to ensure the smooth running of the whole gastrointestinal tract.  

The bacteria are also responsible for assisting in hormone production such as serotonin, which occurs in the highest concentration thorough out the lining of the gut. 

A thriving, balanced microbiome is absolutely essential for the dogs ability to resist or fight disease, control inflammation in the body and for a positive influence on their mental wellbeing.

 Rectum and anal glands.

The faeces are then ready to be expelled along with the indigestible matter and dead red blood cells that it contains. 

Ideally, the dogs stool will be quite firm, which will press on the anal glands as it is passed, causing the glands to naturally empty.     

 All disease begins in the gut - Hippocrates

 Immunity and the gut

The gut forms between 70 - 80% of the immune system and has a vital role in regulating immunity, protecting our bodies from invaders such as allergens and pathogens and controlling inflammation.  

The food we chose for our dogs and the lifestyle choices we make for them will have either a negative or positive effect on their overall gut health, ability to utilise the nutrients in the food they eat, the essential fuel to grow and repair their body and to thrive well into their senior years.                                          

 Caroline Hearn - Canine Holistic Therapist

Winter Bone Broth

As we approach the coldest months of the year we turn to foods which offer comfort and warmth.

We can also provide our dogs with a seasonal variation on the usual bone broth recipe by adding ingredients which are traditionally used to support joint health and immunity.

As game is currently in season, try and find bones from venison, duck, pheasant or partridge. Duck and chicken feet are a good source of glucosamine, chondroitin and gelatine and after many hours of cooking will dissolve into the broth.

Avoid bones with a large amount of fat, skin and central marrow, which will just produce a very fatty and oily broth. Either remove the fat and marrow or chose a different type of bone. If your dog is prone to pancreatitis it is very important to select lean bones, remove any visible fat before cooking and skim off any that comes to the surface during cooking.

You will need approximately 4 - 5 pounds of bones of varying types and size to make a good broth. Some bones, such as ribs will completely break down into the broth, whereas harder bones will be lifted out in large pieces.

You will need:

A slow cooker or large stock pot with a lid

Bones such as duck, venison, pheasant, partridge, chicken, turkey, ox tail, beef, lamb ribs etc.

Enough water to just cover the bones when they are placed in the cooking pot.

1 stick of celery roughly chopped

Cider apple vinegar - 2 tablespoons

Ginger – 1 thumbnail size piece of fresh or half a teaspoon of powered

Turmeric 1 teaspoon (fresh or dried)

Cinnamon - quarter of a teaspoon

Shiitake mushrooms- quarter of a cup (dried or fresh)

1 level tablespoon Autumn Harvest herbal blend

2 grinds of black pepper

How to make:

Place your chosen bones into the pot and pour on the water so they are just covered. Add the cider apple vinegar and black pepper. The slow cooker is used on its lowest setting or a stock pot placed over a very low heat for anywhere between 24 – 30 hours, although some people prefer to leave the broth cooking gently for nearer to 36 hours .You may need to top up with water if the levels are getting very low.

In the remaining 2 hours of cooking add the spices, mushrooms and vegetables.

When complete, turn off the heat and carefully remove the bones with a slotted spoon plus skim off any excess fat that may be on the surface.

As the resulting broth starts to cool, transfer into ice cube trays or suitable sized pots to place in the fridge or freezer for later use. If you want your broth as a set jelly then you could stir in a level tablespoon of gelatine powder.

Store in the fridge and use within 1 week or keep in the freezer and use within 4 months.

Add the defrosted broth to meals, any recipes you make or gently warm through to provide a warm, comforting treat on a very chilly day.

**It is essential to remove the bones and dispose of them safely and under no circumstances should they be fed **

Adding Variation to Raw Diets

If you have been feeding raw complete minces for a while and want to start including some DIY meals, it is important to provide a variety of proteins in order to offer a broad range of nutrients and prevent any deficiencies.

Feeding a selection of fresh food and making full use of seasonal variation means that each meal is an opportunity to add nourishment, support good health, build immunity and increase vitality in our dogs.

 Muscle meat

The majority of a raw diet is made up of muscle meat, and depending on which type of model you feed it could be as much as 80% as in the 80-10-10 (80% muscle meat,10% offal & 10% raw bone) or, in the Barf model 70%, allowing for the addition of vegetables.

Try and offer a selection of meat from different species, ideally 4 or 5 over a month if you can, plus an oily fish. This can include beef, chicken, turkey, pork, buffalo, venison, rabbit, tripe, guinea fowl, goat and lamb, etc.

Rotate white and red meat from different species but also vary the cuts within the same species. So, for example include chicken thighs rather than just feeding breast meat.

Replace some of the proteins with wild game when it is in season, such as pheasant, partridge, duck and venison.

If free range or grass-fed proteins can be introduced, even in small quantities, there is higher nutritional value, particularly with levels of Omega 3 fatty acids.

When making  DIY meals for your dog it is important to  establish the difference between what is fed as muscle meat and what is offal, that way you can calculate the 10% offal ration (5% liver, 5% other offal)  into your meal plan.

 Heart

Although the heart is an internal organ it is often confused as being offal when actually it is a muscle, and a very hard working muscle at that!

Where it does have its similarities is the amount in which it is fed.

It is a rich meat, high in blood content, which like liver can cause diarrhoea if fed in large amounts.

Introduce slowly and work up to between 5% and 10% until your dog can tolerate it. It is not required in large amounts or on a daily basis, but you can incorporate it into the diet within your monthly food balance plan. It is a nutrient dense addition and generally it is cheap to buy, having fallen out of fashion in our own diets over the years.

Heart is high in taurine, iron, folate, carnitine, thiamine, conjugated linoleic acid (CLA), gamma linolenic acid (GLA) selenium and B vitamins.

It is particularly high in Coenzyme Q10 (CoQ10) which is needed to optimize heart rhythm. As CoQ10 levels decrease with age, it is a valuable addition to your senior dog`s diet. Trials show that heart failure patients have low levels, and supplementation can help to stabilise the disease.

With twice as much collagen and elastin as other muscle meat it is a perfect dietary addition for working or competition dogs to prevent fatigue, as well as providing added support for the musculoskeletal system.

 Tongue

This is another protein that’s regarded as muscle meat which can be a little high in fat, so is one to limit if your dog has a pancreas issue or is on a strict weight loss plan.

 Gizzards

Chicken, duck and turkey gizzards have goods levels of iron, selenium, zinc, riboflavin, niacin, choline, copper and vitamin B12. Gizzards are fed as muscle meat.

 Lungs

Lungs, also referred to as “lights,” have some muscle meat and some organ content, so don`t really fit into one specific category.

It can cause loose stools if fed in large amounts or if fed alongside offal, so although a worthwhile addition it is best to limit the amount fed in a single meal and not to exceed 15%.

 Trachea

Great as a natural chew to clean the teeth, and particularly helpful for senior dogs who can no longer handle bones due to missing teeth or gum problems. Trachea is naturally high in glucosamine and chondroitin so supportive to joints. Lamb tracheas are better for small dogs and beef tracheas are suitable for medium to large dogs.

 Offal

Offal makes up 10% of the diet, 5% of which should be liver and the other 5% made up of kidney, spleen, pancreas, testicles and brain. Offal is different from muscle meat in that they are internal organs which secrete.

The inclusion of offal in the raw or home cooked diet provides an abundance of vitamins and minerals. Just introduce into the diet very gradually and adjust to what your dog’s system can cope with to avoid stomach upsets.

 Liver

Liver is the most nutrient dense of the internal organs and makes up 5% of the offal requirement in your dog’s diet.

If you are buying complete meals, you will see on the label that it states 5% liver and 5% other offal.

It provides an abundance of vitamin A, copper, vitamin D, vitamin K, vitamin C, vitamin E, folic acid, choline, vitamin B6, B12, magnesium, iron, thiamine, riboflavin, niacin, folate, selenium, biotin, calcium and phosphorous.

Some people feed liver just twice a week and others, due to the dog’s sensitivity to larger amounts, just add a small amount every day.

 Kidneys

Kidney would be added to make up the other 5% of the offal requirement, possibly mixed with one of the others on the offal list.

It is a good source of vitamin B12, B6, riboflavin, carnitine, iron and folate.

 Pancreas (sweetbreads or thymus)

Pancreas is not always easy to get hold of, but you can ask your butcher or food supplier to source some for you.

It contains a rich supply of digestive enzymes and is a worthwhile addition to any dog’s diet but is particularly good if you’re feeding a dog with a pancreatic insufficiency.

 Spleen

Spleen is another organ that can be difficult to find but can be ordered from a butcher, or you can ask your food supplier if it is included in any of their offal mixes.

It provides good levels of iron, niacin, riboflavin, vitamins B12 & B6, selenium, zinc, and a broad range of amino acids.

 Fish and Shellfish

Most modern-day diets, for ourselves and our dogs, are too high in Omega 6 and 9 due to processed grains, cereals and vegetable oils, which can lead to inflammation, faster aging and can predispose the body to disease.

In contrast, Omega 3 fatty acids offer a wealth of health benefits including anti- inflammatory properties, healthy skin & coat, normal metabolism, joint health and slowing the ageing process as well as supporting brain and cognitive function.

As you can see, this is an important addition to the diet of dogs with skin issues, joint pain, and is an essential for senior dogs in particular.

Feeding the actual fish has far more benefits than fish oil, which can quickly go rancid, causing the inflammation we were trying to prevent.

Pollution is also a consideration when choosing fish. The cleanest are:

·        Sardines, mackerel, pilchards, herring, sprats, halibut, anchovies, whitebait and trout.

·        Mussels and green lipped mussels are good for joint health.

Other forms of Omega 3 are hemp oil, chia seeds, flax seed oil, seaweed, eggs, pumpkin seeds and phytoplankton.

Should your dog hate raw fish and completely refuse to eat it, then the tinned sardines, pilchards or mackerel are a good substitute in either spring water or tomato juice which can be gently rinsed off or drained.

Try and include an oily fish into your dog’s diet two to three times a week.

 Eggs

Eggs provide a high quality, complete source of amino acids which are the building blocks of protein.

A good source of vitamin A, vitamin B12, riboflavin, iron, folate, zinc, selenium, fatty acids, choline, fat soluble vitamin E, D and K.

Just one egg will provide 13 essential vitamins and minerals, including lutein which is essential for eye health.

Free range eggs offer far greater levels of nutrition as the birds would have benefited from a natural lifestyle of foraging and have had sunlight on their backs.

Duck eggs have a larger yolk to white ratio and are higher in protein, fat and contain more Omega 3.

Quail have larger amounts of vitamin B1 and 5 times as much iron and potassium as hen’s eggs. Their protein value is 13% compared to 11% in hen’s eggs. Quail eggs rarely cause allergies, so certainly worth a try if your dog can`t usually tolerate hens’ eggs.

 Bones

Raw edible bones will make up on average 10% of your dog’s meals but sometimes as much as 30% and are an important requirement of the diet.

Bones provide calcium, phosphorous, magnesium, potassium and, depending on the type of bone fed, a supply of fat, cartilage and collagen.

They are also needed in the diet to keep the stools firm, and while most dogs will be fine with 10% bone, occasionally you will come across dogs who require more to keep their faeces firm, and others who will always need offal or vegetables in their diets in order to cope with 10% or they become constipated. Therefore, it is important to feed each dog as an individual.

Raw bones are regarded as either edible, which add to the calcium quota, or recreational, which provide very little calcium but give mental stimulation and teeth cleaning benefits.

Edible bones are raw bones that are completely consumed, usually in one sitting. Examples would be chicken and duck wings, lamb ribs, chicken backs, chicken and duck feet, chicken necks and pigs trotters.

 Vegetables and Berries

The inclusion of vegetables, herbs and berries in the diet provide, phytonutrients which are compounds found in plants with health giving properties, anti-oxidants which protect cells from free radicals and dietary fibre  that acts as a prebiotic to stimulate the growth of beneficial gut bacteria.

Look to add some vibrant leafy green to your dog’s meals, such as kale, spinach, parsley, broccoli, chard, dandelion leaves and red and purple berries including raspberry, blueberry and blackberry.

Start off with a small amount and build up to approximately 10-15% of the meal, if this suits your dog. Vegetables need to be either lightly steamed or feed raw and put into a blender to make a thick puree, this will break down the tough cellular wall in the vegetables and make them more digestible.

Caroline Hearn - Hedgerow Hounds

www.hedgerowhounds.co.uk