The distinction matters because it helps you gauge severity and decide when to seek help. Vets use faecal scoring systems to assess stool consistency objectively, typically on a scale from 1 (hard, dry pellets) to 7 (pure liquid). Ideal stools score around 2-3: firm, formed, moist, and easy to pick up in one piece, i.e. a good firm poop handful!
Loose stools (scores 4-5)
These retain some structure but are softer than normal. You can still pick them up, though they may leave a bit of poo residue on the ground. The shape is visible but poorly defined - think Mr. Whippy. Dogs typically maintain normal toileting frequency and control, with no urgency or straining. This level of upset often resolves quickly with rest.
Diarrhoea (scores 6-7)
This is liquid or watery, with no shape whatsoever. It may puddle, spray, or come out with force. Dogs often show increased frequency - needing to go multiple times per walk or having accidents indoors because they can't hold it in. You might notice urgency: your dog suddenly rushing to the door or squatting repeatedly with little output. Liquid diarrhoea increases dehydration risk significantly.
Volume and colour clues
Large volumes of watery stool typically indicate small intestine issues, where most water absorption happens. Small, frequent puddles with mucus or blood often point to large bowel or colonic problems. Dark, tarry diarrhoea suggests bleeding in the upper digestive tract and needs immediate attention.
Frequency vs consistency
Some dogs produce multiple soft-but-formed stools daily without other symptoms - this differs from true diarrhoea and may relate to diet, fibre content, or individual digestive sensitivity rather than illness (1).
If your dog's stools progress from loose to liquid, or if diarrhoea persists beyond 24 hours, contact your vet. Dehydration develops quickly, particularly in puppies, elderly dogs, or those refusing water.
References
- Kalenyak K, Heilmann RM, van de Lest C, et al. Comparison of the intestinal mucosal microbiota in dogs diagnosed with idiopathic inflammatory bowel disease and dogs with food-responsive diarrhea before and after treatment. FEMS Microbiol Ecol. 2018;94(2). Available from: https://pubmed.ncbi.nlm.nih.gov/29228248/
This content is for general information only and does not replace veterinary advice. Supplements and nutritional products are not licensed veterinary medicines. Always speak to your vet before making changes to your dog’s diet, supplements, or care routine.
