It has been more years than I care to remember since I have had a puppy--I've always had a dog, but I had been tending to "inherit" my step son's older dogs! How do I know when Dakota is teething? Which teeth do they loose first? The last time he had a puppy shot, I asked the vet technician when I could have him neutered (my vet originally said between 5 and 6 mos) and she said probably when his canine teeth come out. when does that usually happen?