How long is this round of doxycycline for?
I ask because what happens with short ineffective rounds is that the bacteria is reduced, almost killed off but not quite...then the antibiotics are stopped and the bacterial levels rise again to where you see the body react and the kitten has an infection again...so you give another short round and the same thing happens again.
You may need to give a continual longer period of antibiotics to be sure you treat this infection. I would discuss that with your vet.
I ask because what happens with short ineffective rounds is that the bacteria is reduced, almost killed off but not quite...then the antibiotics are stopped and the bacterial levels rise again to where you see the body react and the kitten has an infection again...so you give another short round and the same thing happens again.
You may need to give a continual longer period of antibiotics to be sure you treat this infection. I would discuss that with your vet.