Hi everyone I joined the forums today to discuss the short term effects of neutering on dogs' behaviour. This will be long-winded but I don't want to leave anything out in case others recognise the same side effects. My five and a half month old Norfolk Terrier came back from the vets yesterday evening at 5pm after castration in the morning. Everyone at the vets were saying how lively, friendly and like himself he had been very soon after the op, and he did seem to be - with them. When he first saw me at the vets, he completely ignored me, but continued to be charming to strangers. This is odd as he is normally very affectionate when greeting. I put him in the car and he turned away from me and slumped down on the seat - odd as he usually looks at me a lot in car journeys for reassurance. We got home and he wouldn't accept any affection and kept moving away from me - he would only play with his tennis balls and chew. He didn't eat much. He isn't much interested in water, but has had some at least. He didn't respond at all when my boyfriend came home, whereas normally he goes crazy with excitement. Then last night, he didn't want to come on the bed as he usually does for cuddles and kept wanting to go back on the floor to be with his toys. He kept staring at himself in the mirror like he hadn't seen himself before (never does this usually) and he slept right by the bedroom door - whereas usually he goes under the bed. He seemed to be looking at things like they are unfamiliar and noises that he doesn't usually flinch at are making him nervous. He has started grumbling at things that didn't previously bother him, like other people walking past the front door. He has been more than usually averse to me putting his lead on and keeps trying to run away from me when I have taken him out (twice, briefly). His obsession with his toys is interesting too as he isn't normally that bothered about them. The disinterest in affection is particularly upsetting. I am so worried it has destroyed a bond. I know it must hurt him - he keeps licking the area, although not enough to make me worried that he needs a collar. He has scrotum outside now whereas before nothing had descended, so he might be confused by the sudden appearance. I'm not sure if this is just swelling at this stage. I'm just wondering if anyone else saw personality changes in their dog straight after neutering and if so, did they pass over time? I feel so upset and guilty - maybe he is picking up on that guilt and blaming me for the pain he is suffering? btw. we didn't get him neutered to solve behaviour problems but to prevent future ones. Please don't respond with general criticism of neutering/ the age at which he was neutered. What's done is done. I'm just seeking reassurance - really hoping there is some out there from others who have seen the same thing!! (Nb. he is going back to the vet's in two days for a check-up).