Crystals in Dog Urine: Causes, Symptoms, and Treatment (2026 Vet Guide)

You picked up a urinalysis report at the vet, and the word “crystalluria” is staring back at you. So, what does that actually mean, and should you be worried? Crystals in dog urine sound alarming, but they aren’t always a crisis. Sometimes they’re a normal blip. Other times, they’re the first quiet warning that bladder stones are on the way. This guide walks through every type of crystal a vet might find, what causes them, which breeds are prone, and what treatment looks like in 2026. You’ll leave knowing what your vet is really saying, and what to ask next. What Are Crystals in Dog Urine? Urine is basically filtered waste. It carries minerals, salts, and other compounds that the kidneys pull out of the blood. When the urine gets too concentrated with any of those minerals, they can drop out of solution and form microscopic solids. Those solids are crystals. Vets define crystalluria simply as the presence of crystals in the urine, and crystals are just concentrates of naturally occurring minerals. They can appear in perfectly healthy dogs, especially in a sample taken after a meal or a nap, when urine is highly concentrated. Here’s the important part. Crystals are the building bloc...