This is a great discussion. We have been discussing whether to have little Jasper neutered. My husband was not too keen, however, I had noticed that his urine is starting to get a bit smelly. He also runs around our feet, we thought that was just him wanting food, but reading here, it sounds like some mating behaviours! He is only 3 and a half months old, the vet does not want to neuter him until he is 6 months, is this usual?