Anyone have any good reason not to neuter a 1 year old dog? We are trying to decide what to do, and most people (dog trainer, vet, other dog owners) are all for neutering. Breeder says not to. The dog is not aggresive in any way, but is 'marking his territory' i.e. peeing indoors (although we've only had him for two weeks, so maybe he needs more time to settle in). Come to think of it, how long should it take for them to realise that the toilet is outside only if they've never lived in a house?