K/C's mom recommends the bite not collar all the time. She has an adorable pic of Catcher wearing it. I was going to get one for Tic, but the vet was out of the small size and it would have been too late to order by that time.
My vet recommended this when Pico was neutered: take a regular sized washcloth and fold it in half to make a triangle. Fold the point to meet the folded edge and tie it around your baby's neck like a neckerchief and tuck the ends under the "collar". He won't be able to reach his nether regions now.