Cats hide anemia until roughly two thirds of the red cell mass is gone, because a cat at rest needs little oxygen and compensates by raising its heart rate. Three mucous membranes, checked every 2 weeks and graded 1-5, plus 1 count of resting breaths, will show the drift 4-8 weeks before the cat looks sick. White gums, yellow gums or a resting respiratory rate above 40 are reasons to go in today, not next week.
Why the signs arrive so late
A cat's normal packed cell volume (PCV) runs 25-45%. Mild anemia at 20-25% often produces nothing you can see at a glance, because the cat cuts activity by 10-20% and sleeps a little more, and both are easy to explain away in an old cat.
Compensation shows up in numbers before behavior: heart rate rises, then a murmur appears, then the cat stops jumping onto the counter. By the time the gums are chalk white, the PCV is usually under 15%, which is the level where a transfusion is discussed.
Pallor also has mimics: shock, cold and poor light all make gums look white, so the comparison is against the cat's own baseline in the same room light.
The 3 places to look
Place 1 is the gum above the upper canine tooth. Lift the lip with a finger, look at the strip of gum between the tooth and the lip, and press it for 1 second with a fingertip. It should go white and return to pink in 2 seconds or less; that is capillary refill time (CRT).
Place 2 is the conjunctiva inside the lower eyelid. Pull the lid down gently with a thumb, look at the tissue that lines it, and let go. This is the best place to see jaundice, because a yellow tinge appears here before it is obvious on the skin.
Place 3 is the inner ear pinna, seen by folding the ear back under a lamp. It is the least reliable in a cold room: read it last and never grade on it alone.
Use daylight or a white LED, not a warm bulb: a 2700 K bulb adds a yellow cast that fakes jaundice. Read all 3 within 60 seconds.
Grading gum color 1 to 5
Grade 1 is bubble-gum pink and slightly moist, with a CRT of 1-2 seconds. Grade 2 is pink but paler than last month, still moist, CRT 2 seconds. Grade 3 is pale pink, drier, CRT 2-3 seconds.
Grade 4 is very pale, almost white with a hint of pink, and the gum feels tacky. Grade 5 is white or chalk, and the cat is usually quiet and breathing faster. Grade 4 and 5 are same-day visits; grade 3 is a visit within 1 week, with a PCV taken at that visit.
Grade the cat, not the photo: phone cameras auto-white-balance a grade 3 gum into a grade 1. For a record, put a white card in frame and shoot at 15 cm without flash.
The 2 checks, and what they measure
Check 1 is the color grade plus CRT on all 3 sites, written as 3 numbers, for example 2/2/3. Check 2 is the resting respiratory rate: count chest movements for 30 seconds while the cat sleeps, multiply by 2, and write it down. Normal is 20-30 breaths a minute; 30-40 is a recheck in 48 hours; above 40 is today.
Add weight once a month on a baby scale, because a 5% loss in 30 days alongside a grade change moves anemia up the list.
At the clinic, the 2 tests that matter are the PCV and the reticulocyte count. The PCV says how bad it is; the reticulocytes say whether the bone marrow is answering, which separates blood loss and destruction from production failure in 1 visit.
Every 2 weeks, same 4 numbers
The cadence is 14 days, not weekly and not monthly. Weekly is too noisy, because hydration shifts gum color by a grade in either direction; monthly misses a 2-point drop in a cat losing blood slowly.
Write 4 numbers each time: 3 color grades and 1 respiratory rate, plus the date and the weight. After 3 checks you have a trend line, which is what a vet can act on.
Keep it on the same weekday. A cat on flea treatment, one with chronic kidney disease (CKD) and any cat over 10 should stay on this 14-day loop permanently.
What each grade usually means
| Grade | Gum color | Typical PCV, % | Resting breaths per minute | Action |
| 1 | Bubble-gum pink | 30-45 | 20-30 | Recheck in 14 days |
| 2 | Pale pink | 25-30 | 20-30 | Recheck in 14 days, weigh |
| 3 | Pale, dry | 20-25 | 25-35 | PCV within 7 days |
| 4 | Very pale, tacky | 14-19 | 30-40 | Visit today |
| 5 | White or chalk | Under 14 | Over 40 | Emergency now |
When home observation stops
- Gums at grade 4 or 5, or a CRT longer than 3 seconds.
- Yellow gums or yellow ear skin, which points to red cell destruction or liver disease.
- Resting respiratory rate above 40, or open-mouth breathing at rest.
- Black tarry stool, fresh blood in stool, or vomit that looks like coffee grounds.
- Collapse, a heart rate over 240, or a cat that stops eating for 24 hours.
Any 1 of these goes to the clinic the same day. Do not start iron on your own: it helps 1 narrow cause, does nothing for blood loss or immune-mediated destruction, and delays the PCV that would tell you which.
The 4 common causes in cats
Blood loss is first: fleas, hookworms, a bleeding ulcer, or a tumor. A single heavy flea burden can take enough blood from a 3 kg cat to move the PCV 5 points in 3 weeks, which is why flea control is part of anemia care and not a separate topic.
Chronic kidney disease is second, because failing kidneys make less erythropoietin. FeLV and FIV are third, and immune-mediated hemolytic anemia is fourth, the one that can drop a PCV from 30% to 12% in 5 days and needs steroids, not supplements.
All 4 can be present in a cat that looks normal, which is the whole argument for a 2-minute check every 14 days.
Setting it up in 10 minutes
- Pick a fixed day every 14 days and put it in the phone calendar as a repeating event.
- Check the 3 sites in daylight, in the same order, within 60 seconds.
- Grade 1-5 and count 30 seconds of sleeping breaths, then double it.
- Write the date, 3 grades, 1 rate and the weight on one sheet, oldest at the top.
- Take the sheet to every visit; a 6-point drop over 8 weeks is a different case from a single pale day.
A cat that has had 1 anemia workup should also be on a urine watch: the home urine collection guide explains how to catch a sample without stress. For cats over 10, the full lab panel is set out in the senior anemia workup, and the plants and drugs that destroy red cells are listed in the toxicity tables.
Terms mentioned in this article
Frequently asked
Where do I look to tell if my cat is anemic?
Three places: the gum above an upper canine, the conjunctiva inside the lower eyelid, and the inner surface of the ear pinna. Press the gum for 1 second and count how long it takes to go pink again; 2 seconds or less is normal. Grade all 3 in daylight within 60 seconds, because a warm bulb fakes yellow.
How often should I check an anemic cat at home?
Every 14 days, writing 3 color grades plus 1 resting respiratory rate each time, and weighing once a month. Weekly readings are noisy because hydration shifts gum color by a grade, and monthly misses a slow bleed that drops 2 grades in 4 weeks. After 3 checks you have a trend your vet can use.
When is pale gum an emergency?
Grade 4 or 5 gums, a capillary refill time over 3 seconds, yellow gums, open-mouth breathing at rest, a resting rate above 40, black tarry stool or collapse. Any of these means the same day, not the next appointment, because a PCV under 15% is where transfusion gets discussed.