How young can a puppy become pregnant?

The age at which a puppy can become pregnant depends on the breed, with smaller breeds reaching sexual maturity earlier than larger breeds. In general, most puppies reach sexual maturity between 6 and 12 months of age, although some small breeds can reach it as early as 4 months. It is important to note that spaying or neutering your puppy before they reach sexual maturity is recommended to prevent unwanted pregnancies and other health problems.