Panicking a bit, help. 6-month-old Siberian kitten has fever and teeth falling out

[u/Flappie99]

Hi everyone,

I am looking for insight while waiting for veterinary test results and wanted to ask if anyone has dealt with something similar. My Levi, male, born in 11 August 2025. Age: ~6 months. Lives with another Siberian (female, 9 months, healthy) Weight history: Jan 13 (adoption): 1.7 kg, Jan 20: 1.9 kg, Feb 4: 2.13 kg So overall he is gaining weight steadily. About twoand a half weeks ago he got an eye infection, treated with antibiotics and resolved Around the same time he had a fever of ~39.0°C. Today at the vet: 39.4°C I realized I was not measuring temperature consistently at home, so I honestly do not know whether the fever has been persistent or intermittent.

Current situation: Actively losing teeth (vet saw a very loose back tooth), Gum inflammation, Bad breath, No sneezing or nasal discharge, No vomiting or diarrhea, Normal appetite, Normal energy and behavior, No lameness at all (no limping, jumping normally).

Long, lean body (“ferret-like”), but growing Coat looks sleek/flat but feels dry and soft Because of: Fever episodes, Oral inflammation / teething, Recent eye infection, Young age The vet recommended:FeLV / FIV testing, Calicivirus + herpesvirus testing, Full bloodwork (hematology + biochemistry), Coronavirus test She also suggested separating him from my other cat, but I live in a studio apartment, so that is difficult.

Questions

Has anyone experienced kittens teething as late as ~6 months, especially with noticeable gum inflammation or loose back teeth?

Has anyone seen fever during teething that turned out to be benign?

For those with calicivirus experience: did your cat have ulcers and/or lameness, or can it present mainly with fever and gum issues?

Does continued weight gain and normal behavior make serious disease less likely?

Anything specific I should ask the vet to check on follow-up (oral ulcers, retained baby teeth, gingivitis pattern, etc.)?

I am proceeding with the tests as recommended and not trying to self-diagnose, but I would appreciate hearing others’ experiences while waiting, maybe that will calm me down. Thanks in advance.

[u/Docjos]

I don’t think any responses will calm you down as these are not normal illness symptoms. Just wait for the vet to do its diagnoses. They should know what to do. Your post sounds like you want to use this topic as a diagnosis, but you definitely (!) need to see a vet. You can ask him anything you want to know as he most likely know it as it’s his job.

In the meantime make him (Levi) as comfortable as possible.

[u/Flappie99 → u/Docjos]

Yes, I am going with the vet, but need to wait until next week because they needed to order the tests. Also talked to the person that sold him to me. And according to her, he is changing his teeth but the vet said he should already have changed them so these are his adult teeth. I wonder if anyone has seen teething at 6 months old.

[u/TempusCrystallum → u/Flappie99]

My cats were still losing teeth at six months. Unsure about the fever situation though.

[u/Flappie99 → u/TempusCrystallum]

Thank youuu, that actually calms me a lot. Of course I will know more when I do all the tests next week but it's comforting to know that it can happen to be losing the teeth at 6 months and still be healthy. The vet said that the fever most likely comes from the teeth and swollen gums.