Cat urine colour chart UK: what every shade actually means.

Cat urine colour is one of the most reliable at-home health signals you have. Here is what each shade actually means in 2026, in plain English, written for UK owners scooping a tray at 7am.

What does normal cat urine look like?

Healthy feline urine is pale yellow to light amber. In a colour-changing health litter (such as Kittydoctor) this typically reads as yellow or olive — meaning pH is in the safe 6.0–6.5 range and no blood is present.

What does dark yellow or orange cat urine mean?

Dark yellow or orange usually means concentrated, acidic urine — most commonly from dehydration, but also an early signal of metabolic change or developing kidney involvement. Encourage water intake (a fountain often doubles drinking) and book a routine vet check if it persists for more than 48 hours.

What does blue or green cat urine mean?

Blue or green on a colour-changing litter means urinary pH has shifted alkaline — the textbook chemical signature of a UTI or struvite crystals. Book a vet appointment within 24–48 hours. In male cats, treat as urgent because of blockage risk.

What does red or pink cat urine mean?

Red or pink means blood. Even microscopic traces — invisible in clay litter — turn Kittydoctor crystals red. Causes include UTI, bladder stones, FIC, trauma or, less commonly, tumours. Call your vet the same day. If your cat is also straining, treat as an emergency.

What does cloudy cat urine mean?

Cloudiness usually indicates white blood cells, mucus or crystals. On standard litter you'd never see this. On colour-changing litter the accompanying pH shift typically tints the crystals — book a vet appointment within a few days.

When is cat urine colour an emergency?

Same-day vet for: red/pink (blood), persistent dark orange with reduced output, any colour change combined with straining or vocalising. Out-of-hours emergency for: a male cat producing little or no urine, regardless of colour.

How do I monitor cat urine colour at home?

Standard clay or silica litter absorbs urine and hides the colour. Health-monitoring litters use pH-sensitive crystals that turn yellow, orange, blue/green or red in response to your cat's urine chemistry — readable in ten seconds when you scoop. Kittydoctor is the UK option, dispatched from the UK with free delivery over £30.