Call the vet now — today, not next week — if your cat vomits more than two or three times in a single day, if diarrhea runs past 24 hours, if either one shows up with blood or black tarry stool, or if vomiting comes bundled with lethargy, a cat that hides, refuses water, or a belly that's tender to touch. A single hairball, or one loose stool after a meal that went down too fast, is a different category of event and usually doesn't need a phone call.
The sound wakes me before my eyes are open. Two in the morning, bare feet on cold tile, phone flashlight angled low so I don't step in anything. What's on the floor tells me less than what the cat does thirty seconds later — whether she's back at the water bowl, whether she's vanished under the bed, whether she's already asking for breakfast like nothing happened.
I've cleaned up a lot of these over the years, and they are not the same event. Treating them like they are is how people either panic over a hairball or sit on something that needed a call four hours earlier.
Reading the sound and the aftermath
A hairball has a performance attached to it. The cat stretches out long, hacks with her whole body, coughs like something's wedged, and produces a wet tube of fur. It looks alarming and sounds worse, and then she shakes it off and goes to nap.
A meal that went down too fast comes back up almost recognizably. Still shaped like kibble, or still smelling like dinner, usually within half an hour of eating. Some cats do this weekly for years. I know one who has done it since kittenhood and has never once been sick from it.
The one that gets me upright is the quiet vomit. A single episode, no drama, and then the cat walks to the back of the closet and stays there. Or stands over the water bowl and doesn't drink. That is the pivot point for me — not the mess, but the ten minutes after it. Frequency and timing tell me more than volume ever does. Three unremarkable-looking vomits four hours apart worry me far more than one dramatic one that ends with a cat asking for food.
What I actually write down
I keep a note on my phone, and I'm not precious about it. Time of day, how many times, what it looked like. Yellow foam and clear fluid are their own entries. So is anything that looks like coffee grounds or contains hair, or a piece of something she shouldn't have eaten. For stool I'm noting formed, soft, liquid, mucus, streaks of red, or black and tarry. I take a photo of the litter box when I'm unsure, because my memory at 2 a.m. is not reliable and a photo doesn't argue with me.
The rest of the note is behavior. Eating? Drinking? Using the box normally, more, or not at all? Grooming or not grooming? Sleeping in her usual spot or wedged behind the sofa? Those answers are what I bring to the phone, and in my experience the questions at the front desk run in exactly that direction — how many times, when, what did it look like, is she still eating and drinking, has her energy changed, has her weight changed.
That last one is worth more than people think. A kitchen scale and a cat that will sit on it is cheap information, and slow weight loss alongside occasional vomiting is the kind of pattern that's easy to miss day to day and obvious on a spreadsheet.
When the combination is the problem
Vomiting by itself is one data point. Vomiting plus a cat who's flat, or who turns down food she'd normally knock you over for, or who tenses when you run a hand along her belly, is a different picture entirely. Diarrhea plus vomiting together drains a cat faster than either alone, and cats are not generous about showing thirst — a cat who vomits and then refuses water needs to be seen promptly, not observed until morning.
I also weigh age and history heavily. A kitten or a senior goes downhill on a timescale that has embarrassed me before. A cat with an existing condition is not a blank slate, and the vet knows that history better than any note I can write. That's the honest tradeoff in all of this: some cats vomit regularly for years without a crisis, and some go from fine to flat in six hours. I can't tell you which one you have. What I can tell you is that the pattern — frequency, timing, and what else is happening — is the thing worth reporting, and it's the thing that gets sorted out fastest.
Blood, black stool, and other no-wait items
Bright red streaks in stool, black tarry stool, vomiting that won't stop, a cat who's straining and producing nothing — those go on the call-now list without me debating it. So does anything that comes with a swollen or hard abdomen. I don't try to work out the cause at home, and I don't try to assess hydration by pinching skin. I report how much she's drinking and how many times she's urinated, and let someone with a stethoscope and a blood panel do the rest.
The one line I hold firmly: nothing from my own medicine cabinet. No stomach remedies, no tablets split in half, no leftover prescription from another cat. Human medications that seem mild can be genuinely dangerous to a cat, and giving one also muddies the picture for whoever sees her next.
Making the call
When I dial, I read from the note. How many episodes, over how many hours, what it looked like, whether she's eating and drinking, whether her behavior has changed, and how old she is. I ask one direct question: does this need to be seen today, or is this a watch-at-home situation with a check-in tomorrow? Sometimes the answer is come in now. Sometimes it's monitor and call back if the frequency picks up.
Most nights, it's a hairball. I curse, I clean the tile, I go back to bed. The nights it isn't, I'm already dressed before I finish the call.
