My boy puppy is 5 months old and has only one testicle, how long should i leave it before i get him castrated, as i know the longer a testicle remains undropped the higher the risk of testicular cancer. hope someone can advise. There cant be much chance of it dropping now!? Thanks

It may yet drop, but there is no hurry to castrate him and you should be able to wait until he is fully grown at around 18 months of age.

Can you feel it at all up in his body cavity?  My boy's second testicle didn't drop until 5-6 months, but it's not all that unusual for them to stay a little longer.  Some dogs just have one testicle (monorchid) and there is not another inside the body.  Does he have another and it just hasn't dropped, or is there no sign of another one?  Again though, 5 months isn't that old to only have one.

Also, if the second one doesn't drop, you need only have the retained one removed. The other one is at no greater risk of becoming cancerous than if its companion had joined it! My mother had a GR who had his retained testicle removed when he was a year old, and lived to be 14, with no trouble at all from his remaining 'singleton'. It also had the bonus of allowing him to develop to the desired normal male size and build.

I think that it is worth pointing out (although all the advice given is sound) not pocking about the puppy too much I have seen some dogs very traumatised with constant poking and pulling and then even as an adult it is hard to get them to let you work on their back ends for trimming etc. I would ask the vet possibly to check.

my poor cocker spaniel puppy is almost 7 months and neither of his testicles have dropped.  I can't find signs of either one of them anywhere and have been at my wits end.