By the time a puppy is 8 to 10 weeks old, the dog should lkely have a mouth full of 28 teeth. exies/Getty Images Experts recommend getting your young dog to become acclimatized to having its mouth ...

When a puppy is “teething,” its baby teeth are falling out and its adult teeth are coming in, and this all happens within a roughly two-month period between 4 and 6 months of age.