5 min read
White or Chalky Guinea Pig Urine: Calcium vs Bladder Sludge
White crusty marks are often normal calcium in guinea pig urine. Learn when chalky pee becomes sludge, stones risk and what diet changes help.
Why guinea pig urine can look white
Guinea pigs excrete excess calcium through their urine. As it dries, it often leaves white or cloudy marks on fleece, trays or the cage base. Occasional chalky residue is common and usually normal.
When it may be sludge
- Thick, gritty or paste-like urine.
- Straining, squeaking or hunching while peeing.
- Small, frequent amounts of urine.
- Blood in urine or a wet, gritty bottom.
Diet habits that support urinary health
- Grass hay such as timothy rather than alfalfa for adults.
- Plenty of fresh water, offered in both a bottle and a bowl if possible.
- High-calcium greens such as kale, spinach and parsley in moderation, not daily large portions.
- Avoid mineral or calcium supplements unless a vet recommends them.
What to do
If your guinea pig strains or vocalizes while peeing, contact an exotic vet. Bladder sludge and stones are painful and need veterinary assessment, often with imaging.
When to call an exotic vet
This guide is general education, not veterinary advice. If your guinea pig stops eating, stops producing droppings, struggles to breathe, bleeds, or seems suddenly quiet, contact an exotic vet the same day. Guinea pigs hide illness, so small changes matter.