Mojo:
I read this on the Internet this morning and it addresses your statement about the difference in an 8 and 12 week old pup.
Quote:
DEVELOPMENTAL STAGES:* Dog Behavior the Genetic Basis, Scott & Fuller
Pups must be insured to be stimulated to defecate and urinate, when crying always attempt to insure they have voided even if it appears dam is cleaning them
Birth - no senses, taste is developed no other sensory responses
Two to three days - swings head from side to side to touch dam or other whelps indicating sense of touch developing. Other sensory capacities begin developing at about 3 days of age.
EEG studies show full vision is not present until age of 7 to 8 weeks
Hearing appears first at approximately 20 days but is not fully developed to age 6 to 7 weeks
Motor capacities begin to develop at age 7 to 8 weeks but are not fully formed to 12-14 weeks of age.
Learning capacity does not begin until age 1 month for any type of retention
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This is the site where the entire information is located:
http://rievaulx.org/health.html
Pretty interesting . . . there is significant development that takes place after the pup is 6 weeks old and before 12-14 weeks.