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The microbiome of a pet is the sum total of the bacterial and fungal population that normally resides in the gut of a dog or cat that is necessary for proper digestion and promoting immunity from infectious disease at the level of the gut. The microbiome of a person has actually been measured and found to have a mass on average of 2 kg or roughly 4 1/2 pounds. If one can picture how tiny the microscopic bacteria and fungi that comprise the human microbiome, the sheer numbers of these organisms to add up to over 4 pounds is astounding.
Proportionally, we have found the microbiome of dogs and cats to be equivocal, so it is reasonable to conclude that maintaining a healthy microbiome is as important in dogs and cats for maintenance of a healthy GI system as it is in people. There are countless circumstances that can negatively influence the microbiome of dogs and cats beginning with diet. For example, studies have found that dogs fed a high-protein, low-carbohydrate diet had decreases in the ratio of Bacteroidetes to Firmicutes bacteria. Interestingly, the same is not true in most cats, as it seems at least anecdotally, that the opposite may actually be true.
Any metabolic, infectious, autoimmune, or parasitic disease that throws off the homeostasis (metabolic balance) of the body can negatively impact the microbiome of pets. Thus, when veterinarians are presented with chronic gastrointestinal disease in pets, we are commonly recommending general blood work to rule out that the GI disturbance actually be a secondary manifestation of systemic disease elsewhere in the body. Sometimes the microbiome of a pet is negatively affected simply by advancing age.
The importance of a healthy microbiome cannot be overstated. From a primary standpoint, it maintains healthy digestion and a healthy local digestive immune system. This make the pet’s ability to process and absorb food, as well as the ability to fight infection largely dependent on a healthy balance of beneficial gut bacteria and fungi.
Subsequently in any case of chronic disease, whether primary at the level of the gut or elsewhere, a pet should be maintained on a veterinary grade, high quality probiotic supplement, which gives the gut a regular, healthy inoculation of beneficial gut microbes to maintain a healthy microbiome. Since age alone can negatively impact the integrity of the microbiome, I also recommend that any pet over the age of 5 be maintained on a probiotic supplement.
I wrote earlier about the magnitude of the microbiome in terms of shear numbers of microbes that comprise a healthy microbiome. It should subsequently come as no surprise that we have observed that typical probiotic supplements that offer gut microbes in the millions per dose are largely ineffective in significantly boosting the microbiome and positively affecting health. More realistically, in order to effectively promote a healthy microbiome in pets, it is necessary to choose probiotic supplements that offer gut microbes in the billions per dose.
The microbiome may not be the sole answer to every pet’s optimal healthy, but it should be among the first considerations in promoting the overall wellness and health of dogs and cats.
Dr. Roger Welton is a practicing veterinarian and highly regarded media personality through a number of topics and platforms. In addition to being passionate about integrative veterinary medicine for which he is a nationally renowned expert, Dr. Welton was also an accomplished college lacrosse player and remains to this day very involved in the sport. He is president of Maybeck Animal Hospital , runs the successful veterinary/animal health blogs Web-DVM and Dr. Roger’s Holistic Veterinary Care, and fulfills his passion for lacrosse through his lacrosse and sport blog, The Creator’s Game.