Has he been neutered ? Had his initial vaccinations?
Is he indoor only or does he go outside?
Any flea problems, past or present?
Do you notice any abdominal swelling ?
Doesn't it always happen? Something like this on a Friday afternoon/night right after the vets close and the only option is an emergency care center.
Well, let's try to manage this the best we can until you can have him seen (many vets are open tomorrow).
I'd like it if you actually saw him use the litter box and make both stool and urine normally. That would be a great relief so please watch carefully for that over the next few hours (I'll be here for quite a while tonight).
I'd also like you to actually see him eat something. Put out some canned food that he can't resist and be sure about this. It's important that he keep it down (no vomiting) over the next few hours as well.
Take a look at his back end and note any swelling, redness or anything else unusual.
I'd also like you to take his temperature.
If you don't have a thermometer specifically for animal use, you're going to convert the current ‘people' plastic digital thermometer right now. You can always pick up another people thermometer tomorrow, but at this moment, you're going to take your companion's temp.
Put a dab of KY Jelly or even petroleum jelly at the tip. In a pinch, a bit of cooking oil will do. Make sure the thermometer is ‘on' and insert it about 1" into the anus, ever so gently and while soothing them, keeping things calm.
Normal temps for both dogs and cats are between 100.5 and 102.5
Let me know what you find ok?
That temp is pretty high, but in that he's eating still is very encouraging.
Keep him on only canned/soft food until seeing the vet, to help maintain his hydration, especially with this temp.
Try to encourage more drinking, even if you need to use an eyedropper every 20-30 minutes (hopefully he'll just cooperate and drink, even some watered down milk is acceptable in situations like this. Keep in mind though that dairy is not good for cats overall).
Cold packs at his pulse points (inside of shoulder/thighs) for a few minutes every hour may also help.
Though I'm sure he's not happy with the temp taking, please monitor. It's also going to be worthwhile to have an urgent care center in mind, just in case.
Urgent care centers are usually regular vet offices that have 'after hours' care, so make calls and find out. Sometimes they'll be listed when you call a vet that's closed, as their recordings give emergency numbers.
I'm here for a few more hours, so don't worry about delaying responses. I'll see you (just be patient with me if I'm working with someone else it might take several minutes for me to get back to you, ok?)
When is the last time you know for sure he made urine or stool?
This is perplexing and part of me hopes your thermometer is wrong.
There are only a few things typically associated with unexplained fever; however, my impression is that this is an indoor cat. He's been vaccinated and came from the Humane Society which would often mean he's been checked for Feline Leukemia Virus before being adopted out. He hasn't been around other cats or boarded and the only other cat in the home is perfectly fine.
Please correct me if any of these statements are wrong ok?
You've had him for about a year now without any health complications until now, right?
How about cleaning the thermometer thoroughly with alcohol and firm rubbing, rinse and dry, then taking your other cat's temp. It may help determine whether the temp is a mis-read or not.
Thanks for that confirmation.
I'd find an urgent care clinic, make a call and ask them whatever details are necessary to have with you if you need to bring your boy in tonight.
Since he's still producing at least some urine/stool, is interested in eating/drinking and this is all rather a sudden onset, hopefully the cold packs will get his temp down and get you all through the night until you can see someone tomorrow.
This next advice is something I almost never recommend, but in this case and based on your own judgement, it may be worthwhile:
Aspirin for cats may be offered in certain situations, usually at a dose of 10 mg per kg (since 1 kg = 2.2 lbs, this is just 5 mg per lb of body weight). If you have a 6 lb cat, this would mean less than half of a baby aspirin (which is 80-81mg).
Between that and some cold packs (be sure not to use ice, or at least wrap it very well so you don't hurt his skin with the cold), it should get the temp down and buy you some time until being able to get him seen first thing tomorrow.
With this said, do not hestitate to take him in if you sense even a little bit that it's necessary. You're seeing him and you know your cat - trust your instincts. Do not trust me and do not trust anyone or anywhere else on the internet ok? Only you are seeing him and know what you 'feel'.
Again, I'll be here for at least a couple more hours, so let me know.
I'm West coast by the way. Where are you?
Thank you too.
Please let me know what happens.
You can also try just keeping his foot pads wet with cool water to help bring the temp down. If you find it surpasses 105, nearing 106 there is a significantly higher chance of seizures - so keep an eye on him. You might not be getting a lot of sleep with that one eye open, but that's what happens when we have cats. Just like kids.
Again, thank you and remember that you can re open this question anytime and you do not have to press accept again.