With 3-Down, way of measuring a pup’s age Crossword Clue

 The answer to the crossword clue "With 3-Down, way of measuring a pup's age" is TEETH.

3-Down is the clue "Puppy's pearly whites", so the answer to the clue "With 3-Down, way of measuring a pup's age" is TEETH.

Puppies are born with no teeth, but they start to grow in at around 3 weeks old. By the time they are 6 months old, they will have all of their adult teeth.

The number of teeth a puppy has can be used to estimate its age. For example, a puppy with 8 teeth is likely to be around 3 weeks old, while a puppy with 28 teeth is likely to be around 6 months old.

Of course, there are other factors that can affect a puppy's development, such as breed and diet. So, it is always best to consult with a veterinarian to get an accurate estimate of your puppy's age.