Gum colour is the single observation that vets ask about most often on the phone, and the one owners are least prepared to answer. It takes about ten seconds to look. The problem is almost never the looking - it is that nobody ever told you what your own animal looks like when nothing is wrong, so at two in the morning you have nothing to compare against.
This page fixes that in the only order that works: learn your pet’s normal today, while everything is fine, so that the abnormal is obvious later. Then, if a night ever comes, you have a sentence ready for the vet instead of a guess.
The whole page in one rule
You are looking for a change, not a diagnosis. Any gum colour that is not your animal’s usual colour is a reason to phone your own vet or an emergency vet now and say what you saw. Gum colour never tells you it is safe to wait. It can only ever tell you to hurry.
What gum colour is, and what it is not
The gums are one of the few places on a dog or a cat where you can see a thin, unpigmented membrane over a rich blood supply without any equipment at all. That is the entire reason vets ask about them. It is a window, not a verdict.
What it is not is a test. A colour does not name a condition. The same shade can arise from causes that have nothing to do with each other, and two animals in identical trouble can look different because one has naturally darker gums than the other. Anyone - including this page - who tells you that a particular colour means a particular illness is guessing on your behalf, and you are the one who would pay for the guess.
So we are not going to do that. Below, every colour you might see is paired with one thing only: what to do about it. In almost every case that is the same thing, phrased the same way, because it genuinely is the same thing.
Do this today, not tonight: learn your pet’s normal
This is the part of the page that is worth your time while nothing is wrong. It takes two minutes, once, and it is the difference between telling a vet “his gums look a bit pale I think” and telling them “his gums are noticeably paler than the photo I took in June.” One of those is a shrug. The other is information.
- Pick a calm moment. After a meal, on the sofa, when your animal is relaxed and has no reason to think anything is happening.
- Use daylight if you can. Household bulbs, and phone screens, shift colours badly. A window in the afternoon is the most honest light you have. If it is dark, use a plain torch rather than a coloured or warm-tinted lamp.
- Lift the upper lip gently at the side, the way you would lift a curtain - not by opening the mouth. You want to see the gum above the upper canine or the teeth just behind it. You do not need to see inside the mouth at all.
- Take a photograph. Flash off, daylight on. Then take a second one of the inner surface of a lower eyelid if your animal tolerates it easily, gently drawing the lid down with a fingertip.
- Label it and keep it somewhere you will find it at 3am - a favourites album, or printed and folded into the pet emergency folder with the rest of your animal’s paperwork.
Do it for every animal in the house. They will not match each other, and that is exactly the point.
If your pet has black or mottled gums, you are not unlucky and you have not lost the observation. Many dogs - and plenty of cats - have pigmented gums in patches or entirely. Photograph the places on your animal that are pink: often the inner surface of the lower eyelid, the inside of a lip, or a patch of gum between pigmented areas. Whatever pink you can find on your animal is your reference point, and the vet will accept it.
How to look, in ten seconds, without a fight
In an emergency the rules change slightly, and it is worth being clear about them in advance, because the wrong instinct here gets people bitten by animals who have never bitten anyone.
- Lift the lip. Do not open the mouth. You are peeling back a lip at the side with one finger, for a second. That is all.
- If your animal objects at all, stop immediately. A pet who is frightened, in pain, struggling to breathe, or not fully aware of you may snap without warning, and an animal who is having trouble breathing can be made dramatically worse by being restrained. Let go.
- Not being able to look is itself information. Say it on the phone exactly like that: “I could not check her gums because she would not let me near her mouth.” A vet hears that as meaningful, not as failure.
- Never put your hands inside the mouth, never pull the tongue, and never try to look down the throat. There is nothing you can see in there that is worth what can go wrong.
- Never delay a call to go and look. If your animal is collapsing, struggling to breathe, bleeding heavily, fitting, or you simply feel that something is badly wrong, phone first and look afterwards, while the phone is ringing. The colour is not worth thirty seconds.
What you might see, and what to do about it
Read the action, not the colour name. The colour names below are only there to help you find your place. Notice that they nearly all end the same way - that is not laziness, it is the honest answer.
What you might see: A colour somewhere between pale salmon and bubblegum, wet-looking, matching what you photographed when your animal was well.
What to do: This matches your reference photo, so the colour is not adding anything to the picture tonight. It does not clear your animal of anything. If the rest of your pet is wrong - if they are quiet, hiding, straining, refusing food, breathing oddly, or simply not themselves - phone your own vet or an emergency vet anyway and describe the behaviour. Normal gums have never been permission to wait.
What you might see: The pink has drained out. Next to your reference photo the difference is obvious rather than debatable.
What to do: Phone your own vet, or an emergency vet if yours is closed, now. Say the word pale, say how it compares with normal, and say when you first noticed. Do not wait for the surgery to open and do not wait to see whether it improves.
What you might see: A dusky, bruised-looking tint to the gums, sometimes the tongue as well.
What to do: Treat this as an emergency and phone now - say the word blue to whoever answers, because it changes how the call is handled. Keep your animal still and let them choose their own position rather than lifting or carrying them into one. If there is smoke, a fume source, a heater or a running engine anywhere near, get yourself and your animal into fresh air first and tell the vet that too.
What you might see: A deeper or more intense red than your animal’s normal, sometimes described as looking angry or inflamed.
What to do: Phone now. Mention anything the animal has been near or in tonight - heat, exercise, a car, a closed room, a heater, a chemical, anything at all - because the context matters more than the shade.
What you might see: A yellow or mustard cast, often easiest to see in the whites of the eyes or the inside of an ear rather than the gums themselves.
What to do: Phone your own vet today, and an emergency vet tonight if your animal is also quiet, off food, or vomiting. This is not something to watch over a weekend.
What you might see: The gum feels sticky against a fingertip instead of slick, or looks matt rather than glossy.
What to do: Report it on the phone as one of your observations. Do not give anything by mouth to make up for it - no water, no milk, no food, nothing - unless your own vet has told you to. That instruction is not caution for its own sake; it genuinely matters, and the reasons are set out on what not to do.
What you might see: Blood at the gum line without an obvious injury, or small flat red or purple marks in the gum or the inside of the lip.
What to do: Phone now, and photograph it before you go if you can do so without a struggle. Do not press on the area to see whether it blanches.
Capillary refill: the second observation, and its limits
If a vet asks you about gum colour, the next question is often how quickly the colour comes back after you press. It is worth knowing what they are asking for, and worth knowing when not to attempt it.
Press a fingertip lightly against a pink area of gum for a moment and lift it off. The spot goes pale under the pressure and then refills. What the vet wants is a rough count of how long the refill takes, and whether it is faster or slower than it was when you practised on a healthy day. Practise it once, in daylight, on the same calm afternoon you take the photograph - because a number means nothing without your own baseline, and because a struggling animal is the worst possible time to try something for the first time.
- Do not attempt it on an animal who is distressed, in pain, breathing badly, or unwilling. The observation is not worth a bite or a panic.
- Do not press hard, and do not repeat it over and over.
- Do not use it to reassure yourself. A refill that looks fine does not cancel out an animal who is behaving wrongly. Nothing you can measure at home does.
- Say what you got, plainly, including if you got nothing. “It came back slower than usual” and “I could not do it, she pulled away” are both real answers.
Cats are harder, and that is normal
Cats hide illness for a living, and they are considerably less willing than most dogs to have a lip lifted. Several things follow from that, and none of them are your fault.
- A cat who lets you do something they would normally refuse is telling you something. Unusual tolerance is a symptom in its own right - mention it.
- If a cat will not have their mouth touched, look at the inner surface of a lower eyelid instead, or the inside of a lip, or simply do not look. Do not corner a frightened cat for a colour.
- A cat breathing with an open mouth, or breathing fast at rest, is an emergency call regardless of gum colour, and you should not spend time on the gums first. So is a male cat straining in the litter tray.
- Cats reach the point of collapse from a distance that dog owners find surprising. Being early is not being dramatic.
If it is a cat and something has been eaten or chewed, start at my cat ate something rather than here - and if lilies are anywhere in the story, go there immediately and do not read anything else first.
What to say when they pick up
The reason to look at the gums at all is that it gives you a sentence worth saying. Have these ready before you dial, and if you have not got all of them, dial anyway.
- Species, rough age and rough weight.
- The colour, compared with normal - “paler than usual” is better than “pale”, and “I have a photo from June that looks different” is better than both.
- When you first noticed, by the clock if you can.
- What else is wrong - breathing, posture, appetite, energy, toileting, anything that changed today.
- Anything they could have eaten, licked or chewed, however unlikely it sounds.
- What you have and have not been able to check, honestly.
The full version of this, in a form you can read off the screen while you talk, is before you call the vet. It is worth opening in a second tab now rather than looking for it later.
The absolute rules, which do not have exceptions
- Do not put your hands into your pet’s mouth, and do not give anything by mouth - no water, no milk, no food, nothing from a cupboard - unless your own vet has told you to.
- Do not try to make your animal sick. Not with anything, not for any reason, unless a vet on the phone tells you to do it and tells you how.
- Do not give a human medicine. Not a painkiller, not anything else, not a small amount, not once.
- Do not let checking the gums delay the call. If your instinct says something is badly wrong, the instinct is the information. Phone.
- Do not use this page, or any page, to decide that your animal is fine. It cannot do that. Nothing written before your animal existed can do that.
Where this page sits
This is a Warning Signs page. It belongs to the group whose job is recognising, early, that a night has started - not treating anything.
- Deciding whether this is an emergency at all: is this an emergency?
- Breathing and panting: why dogs pant.
- Shaking and trembling: why dogs shake.
- Posture and behaviour: the body language decoder.
- Something has been eaten: my dog ate something or my cat ate something, then the poison control directory.
- Preparing for the call: before you call the vet.
- What not to do while you wait: first aid: what not to do.
- Finding someone open: find an emergency vet.
Where this comes from
Gum colour and capillary refill are standard parts of a physical examination, described in the general veterinary literature - the Merck Veterinary Manual and the Cornell Feline Health Center are the two open references we point readers to most often. We have deliberately not reproduced the diagnostic interpretations those sources give to clinicians, because interpreting them requires the rest of an examination, which you do not have and we cannot give you.
What we have kept is the part that survives translation to a kitchen at midnight: look, compare with your own animal’s normal, and phone. That part is not controversial anywhere.
