Fiber-blend supplement study points to GI benefits in dogs and cats

A fiber-blend supplement aimed at supporting gut health in dogs and cats is getting fresh attention after a June 12, 2026, dvm360 report said a 30-day study in 75 dogs and 50 cats found improved fecal consistency and favorable modulation of gut bacterial composition. The supplement, referred to in the source material as Fiber Biome Blend, appears to align with AnimalBiome’s Complete Fiber Blend product line, which the company positions as a microbiome-support supplement for both species. (dvm360.com)

The broader backdrop is a steady shift in small-animal GI care toward microbiome-aware nutrition. Over the past several years, veterinary researchers and clinicians have paid closer attention to how soluble and insoluble fibers, prebiotics, and mixed fiber bundles affect stool quality, fermentation patterns, and microbial balance. In a December 2024 dvm360 article summarizing a continuing education session, Valerie Parker, DVM, DACVIM (Nutrition), said fiber is often underused, can reduce reliance on other microbiome modifiers, and in many mild or chronic diarrhea cases should be considered before antibiotics. (dvm360.com)

What’s new here is the cross-species signal. The dvm360 abstract describes a 30-day evaluation in 125 total animals, with positive effects on both fecal consistency and microbiome balance. AnimalBiome’s own public materials describe its Complete Fiber Blend as a mix of organic beets, larch arabinogalactan, and mannan-oligosaccharides, designed to ferment at different rates and support beneficial microbial populations throughout the GI tract. On its research page, the company says a completed study found improved fecal consistency in 70% of dogs with diarrhea or soft stools, relief of constipation in all dogs and one-third of cats, and maintenance of healthy stool consistency in healthy dogs. (animalbiome.vet)

There are still important gaps. AnimalBiome’s research page cites a survey of 65 dogs and 42 cats, while the dvm360 abstract references 75 dogs and 50 cats. That discrepancy may reflect different cuts of the data, a broader dataset summarized by dvm360, or updates not yet reflected on the company website, but it means clinicians should be cautious about overinterpreting the findings until a full methods section is available. I did not find a peer-reviewed paper or formal public abstract for this exact study in the accessible search results. (animalbiome.com)

Even so, the findings fit with a larger evidence base suggesting fiber choice matters. A 2022 BMC Veterinary Research study in dogs with chronic large-bowel diarrhea found that a fiber-supplemented dietary intervention improved clinical signs and shifted gut metabolism from a more proteolytic to a more saccharolytic fermentative state. More recent work has also linked increased dietary fiber intake with improved fecal and clinical activity scores in dogs with chronic enteropathy, while other studies show that outcomes vary depending on the fiber source and formulation. (pubmed.ncbi.nlm.nih.gov)

Expert commentary in the field has been consistent on the mechanism, if not on any one product. Parker said soluble fiber can bind water, slow transit, and support production of short-chain fatty acids that nourish colonocytes, lower colonic pH, and help maintain epithelial barrier function. She also noted that mixed-fiber approaches can be useful across GI presentations, including stress colitis, fiber-responsive diarrhea, and constipation. That framework helps explain why a blend containing multiple prebiotic fibers might show benefit in both dogs and cats, especially in patients with mild stool-quality issues rather than severe inflammatory disease. (dvm360.com)

Why it matters: For veterinary teams, this is less about one supplement and more about where GI management is heading. The study adds another signal that relatively simple nutritional tools may improve stool quality and support microbial balance without escalating immediately to antibiotics or more complex interventions. But it also underscores a familiar challenge in microbiome medicine: promising early data often arrive through company summaries or trade coverage before peer-reviewed details are available. That means clinicians should weigh product claims against the patient’s diagnosis, diet history, concurrent therapies, and the still-evolving evidence base around microbiome endpoints. (dvm360.com)

What to watch: The next key step is publication of the full study or presentation of detailed results, including controls, inclusion criteria, fecal scoring methods, adverse events, and the specific bacterial changes observed, which would help veterinarians judge where this kind of fiber blend fits in routine GI care. (animalbiome.com)