Formulated by Dr. Karen Becker with three distinct microbial ecosystems that create a resilient, well-adapted, and functional gut flora.
 
Product Information
Most pet probiotics are not truly dog‑specific, often using human strains that are poorly adapted to the canine digestive tract, immune system, bile environment, and body temperature.
PRIMITIVE PROBIOTICS™ uses species-aligned, healthy microbes sourced from wild canids, healthy domestic dogs, and soil-based organisms—mirroring how dogs naturally evolved to acquire beneficial bacteria.
A three‑ecosystem approach restores microbial diversity, combining ancestral strains, modern canine strains, and resilient soil‑based organisms to create a stable, functional, and adaptable gut microbiome.
Clinically studied strains deliver targeted benefits, including improved stool quality, reduced diarrhea and gas, stronger immunity, calmer behavior, allergy relief, and better resilience after antibiotics or stress.
The formula is science‑backed, safe, and results‑driven, third‑party tested, free from fillers and prebiotics, suitable for all life stages, and designed specifically for the modern dog’s biological needs.
Many microbiome-damaging insults disrupt serotonin production in the gut, making anxiety and behavior problems worse. This is the first veterinary-formulated product that blends LP815, a patented, calming strain, with S. boulardii, the strain recommended for use during antibiotic therapy to reduce microbiome damage.
 
Directions of Use
Sprinkle the recommended amount directly onto food or a snack once daily.
For dogs with sensitive stomachs, start with half the suggested dose for the first few days and gradually increase to a full dose.
If using during antibiotic therapy, give the probiotic at least 4 hours before or after antibiotics to help protect beneficial bacteria. (based on 1 Billion CFU per 1.5 g serving)
 
Small Dogs: under 15 lbs - 1/2 scoop(0.75 g)
Medium Dogs: under 15-40 lbs - 1 scoop(1.5 g)
Large Dogs: under 40-80 lbs1 - 1 ½ scoop(2.25 g)
Extra Large Dogs: over 80 lbs - 2 scoops(3 g)
 
Product Ingredients
Canine Heritage Blend - Dog Strains: 600 Million CFU
Lactobacillus casei K9-1
Lactobacillus fermentum K9-2
Lactobacillus reuteri PCR7 
Pediococcus acidilactici PCLL01
Bifidobacterium bifidum
Bacillus subtilis
Non-Spore Forming Probiotics and Yeast Blend: 200 Million CFU
Lactiplantibacillus plantarum LP815™
Saccharomyces boulardii
Lactobacillus rhamnosus GG
Soil-Based Probiotics Blend: 150 Million CFU
OptiBiome BS50® Bacillus subtilis
MuniSpore® Bacillus clausii CS108
Canine Ancestral Blends - Wolf Strain: 50 Million CFU
Lactobacillus reuteri WF-1
Lactobacillus brevis WF-1B
Inactive: Organic Pumpkin Powder (Cucurbita moschata)