My cat is weak, vomiting, and lethargic after being outside in cold.

I would recommend keeping a very close eye on your cat for the next 12 to 24 hours. When cats are free to roam outside they are more prone to getting in fights and ingesting something toxic. If she does not eat this evening or tomorrow morning and she is still acting lethargic and I would recommend taking her in to your vet to be checked out.

This temperature is slightly below normal. Normal temp is 37.7 to 38.8. We can sometimes see the body temp be a bit below normal when their blood circulation is less not as good as it should be — most often we see this this due to heart disease or dehydration. If he is very dumpy and lethargic (which is what I assume you mean by “lifeless”) and recently vomited as well, please take him to your vet. They may recommend blood tests and possibly xrays. Treatment will depend on what they find on exam and any testing.

This could be a sign that she's sick. Lethargy is a very general sign of illness, and it could be caused by systemic illness, infection, inflammation, or injury. I'd take her into the vet in the morning to get checked out. Best of luck.

I would err on the side of caution and get them seen today if you can, tomorrow, especially if they don't seem better. The vomitus looks like a hairball to me, but it's hard to tell. They may have overeaten, but unless that's something they already do, given the opportunity, I don't see that being as likely as something else, possibly getting into something they shouldn't have. Your vet will do an exam, possibly bloodwork, and maybe more//other diagnostics depending on what they find. Based on these results, your vet will have a better idea of what's going on and be able to recommend a treatment plan if needed.

Hypothermic kittens can be much more sick than they let on. Vomiting can be caused by many things, including hairballs, food allergy, eating too fast, GI blockage, intestinal parasites, IBD, systemic disease (liver, kidney, pancreas, diabetes), among others. If the vomiting happens for more than 24 hours, or if Tom does not eat in that time, he needs to see a vet immediately. Continue to encourage him to drink water and eat canned cat food. You can use a heating pad on the low setting to help warm him up, but check often that it is not too hot as it is quite easy to burn their skin. You can leave the heating pad where he can sit on it, but if he moves away do not force him to go back.

Unfortunately lethargy is a very common sign of many things include systemic illness, infection, injury, or inflammation. t's good that Gizmo is seeing a vet tomorrow. Keep him warm and comfortable, and keep him indoors for now if he's allowed outdoors. Best of luck.

It sounds like Kara may be pretty unwell. There are so many potential causes for her to act this way - it can be very concerning when a cat stops eating, sometimes it is due to a fever. Please take her for a veterinary exam as soon as possible to try to determine what could be wrong. Your vet may suggest tests like blood work and xrays to determine the cause of her illness. They will be able to ask you more questions to narrow down a diagnosis. Hope Kara feels better soon!