Understanding Probiotics for Dogs: Strains, CFUs, and What Actually Works

Understanding Probiotics for Dogs

The pet probiotic market is booming, but understanding which products actually work requires knowing about strains, colony-forming units (CFUs), and delivery mechanisms.

Key Probiotic Strains for Dogs

Enterococcus faecium (SF68)

The most clinically studied strain for dogs. Used in Purina FortiFlora with proven efficacy for acute diarrhea.

Lactobacillus acidophilus

Supports general gut health and immune function. Common in multi-strain formulas.

Bifidobacterium animalis

Shown to reduce time to resolution of acute diarrhea in dogs.

How Many CFUs Do Dogs Need?

• Minimum effective: 1 billion CFU/day
• Therapeutic dose: 5-10 billion CFU/day
• Note: More isn't always better — strain selection matters more

Survival Through Digestion

Not all probiotics survive stomach acid. Look for:

• Microencapsulated formulas
• Spore-forming strains (Bacillus)
• Products with guaranteed live cultures at expiration

PSI+ Evaluation Criteria

Our scoring system evaluates probiotic products on strain specificity, CFU count, survival technology, and clinical evidence.