Hello and thank you for your question.
Are there any other injuries?
Is He neutered?
Where the amoxi drops for him or another pet? When were they given?
Ok, thank you for the information.
If he has a history of getting attacked by other animals or is fighting while outside(which I would suspect from the wound on the neck).It is very possible that the lump you are feeling is an abscess. This happens very often with cats that go outside. Abscesses are pus filled pockets under the skin and can be very painful.
You can give amoxi drops to help start the healing process, however please know that if you have left over antibiotics it is possible your other kitty may have a recurrence of the problem. You always want to finish all antibiotics.
I would give the amoxi twice daily until he can be seen by a vet on Monday. While you can start the antibiotics I would still recommend having him seen by your veterinarian.
Abscess's are an infection and can make your baby very sick if not treated properly. Abscesses are often drained and repaired via surgical intervention.
Please continue to monitor his food and water intake as well as his bathroom habits.
If he appears worse before Monday I would recommend having him seen at you local ER.
Please let me know how he is doing.
Candy
Technician
Practicing Veterinary Technician for 23 years. Veterinary Practice Owner, Technician Trainer