My friend has a 12 mth old boxer male, not castrated and he's been having problems for a couple of months wetting his bed, he seems to be dribbling, had tests done found bacteria in his urine and was on anti-bio's for 3 weeks, was a little better but problem still occurs.
Has anyone experienced this in boxers or any other breed as she is becoming quite anxious about it.
thanks

It could be that the antibiotics haven't quite cleared it and he needs another course/stronger course ;)  If left a UTI can track upwards and cause infection further up  so it does need sorting ;)

I'd take another sample to the vet for testing, as it could just need a different course of ab's.

I agree that his original problem hasn't been sorted.  A longer course of antibiotics are on the cards I reckon.