Answering some of your questions about your dog's teeth, and how to keep them healthy! How many teeth does a dog have? Puppies have 28 needle sharp teeth, and adult dogs have 42. Will my puppy lose his teeth? Yes he will, and be careful because stepping on them is extremely painful! Most of the time your puppy will swallow them but they do occasionally end up lodged in the carpet, ready for your unsuspecting barefoot. Puppies will start to lose their teeth around 4-5 months o