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There are a couple of reliable phases of development for all puppies. From the day they are conceived until around three weeks old, puppies are greatly delicate and dependent upon their moms. At this age, their "Eyes stay shut during childbirth and remain shut until two weeks of age," clarifies dr. Klein. 

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From three weeks to two months, puppies turn out to be significantly more portable; drawing in with their littermates and their general surroundings. In the vicinity of two and three months of age "A puppy experiences diverse circumstances, which could cause misgiving x positive fortification is expected to anticipate future mental nervousness," alerts dr. Klein. 

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"From 3 to a half year of age, puppies begin their 'horrendous twos,' as they are getting teeth, dynamic and testing. Ages 6 to a year can be comprehended as a puppy's 'high school' years, unbalanced rationally and physically. They are at their most dynamic and fun loving and, in a few breeds, may begin to create sexual development."