In dogs and cats, just like in humans, the gut microbiota forms a true living ecosystem. It consists of billions of microorganisms—bacteria, viruses, parasites, and non-pathogenic fungi—that coexist in the digestive tract, primarily in the colon. This microbiota plays a key role in digestion, the synthesis of certain vitamins, protection against pathogens, the development of the immune system… and even communication with the brain via the gut-brain axis. Sometimes, the microbiota is referred to as an organ in its own right.
To support this delicate balance, we often hear about biotics: prebiotics, probiotics, postbiotics, or even synbiotics. But what do these terms mean, and how do they differ?
Prebiotics: Feeding the Good Bacteria
The Prebiotics are fibers or non-digestible substances for the host, but fermented by certain beneficial bacteria in the gut microbiota. They promote their growth and activity.
Among the best-known are fructo-oligosaccharides (FOS), inulin, and galacto-oligosaccharides (GOS). These compounds selectively stimulate beneficial bacteria, support proper intestinal barrier function, and help strengthen natural defenses.
Probiotics: Live Microorganisms
The Probiotics are live microorganisms which, when administered in adequate amounts, confer a health benefit on the host. To be effective, they must withstand gastric acidity and reach the colon alive.
In dogs and cats, the strain Enterococcus faecium is found among others. These bacteria can help balance the gut microbiota, modulate inflammation, strengthen natural defenses, and alleviate certain digestive disorders.
Postbiotics: Inactivated Bacteria, Yet Active
The Postbiotics are microorganisms Inactivatedparticularly under moderate heat (known as tyndallization), and/or their components, which offer health benefits. Unlike probiotics, they are no longer alive, but their health benefits have been proven.
These inactivated bacteria may help maintain a healthy gut microbiota balance, support local and systemic defenses, and reduce the harmful effects of antibiotics on the gut microbiota. They also offer the advantage of enhanced stability compared to live probiotics, particularly under more challenging storage or formulation conditions.
Synbiotics: The Pre + Pro Alliance
A synbiotic is a combination of prebiotics and probiotics, designed to maximize the benefits of both. The prebiotic acts as a "substrate" for the probiotic: it helps it survive, grow, and perform its functions once in the digestive tract.
This is an interesting strategy, particularly in cases of microbiota imbalance (dysbiosis), which can occur due to stress, dietary changes, antibiotic treatment, or illness.
In short
The gut microbiota lies at the heart of digestive health, natural defenses, and the overall well-being of animals. Pre-, pro-, post-, and synbiotics are all tools to support it, each with a specific mode of action. Thoughtful use can help maintain the intestinal balance of dogs and cats at every stage of their lives.
