Puppies are born blind, deaf, and toothless, but able to smell.
Puppies begin developing permanent teeth around the 12-week mark.
Puppies’ eyes and ears begin to open at 10 to 16 days of age.
Puppies spend on average 14 hours of every day sleeping.
The growth rate of puppies varies widely, depending on the size of the dog. Birth weights can multiply more than tenfold within the first 7 to 8 weeks.
Puppies go through several developmental stages early in life: neonatal (0-2 weeks), transitional (2-4 weeks), socialization (3-12 weeks), and adolescence (6-18 months).