We just got a new puppy. She is a dal/akita mix. We will be getting her fixed when she is 6 months old. However, I have an 11 year old shelty/beagle mix who is not neutured and I am pretty sure that they will be around the same size and weight (he is about 55lbs). I was wondering if he will still try to breed with her even if she is spayed and if so is this bad or not?? I have discussed neuturing him with my vet, but he warns against it because of his age and health. He is a generally healthy dog, but does have some arthritis and kidney issues, which makes my vet not really want to perform any surgeries on him unless it is completely necessary.