[lisatodd]

just remember, this is all a guess.
my kirby at eight weeks 4lbs and is now 5.9 per his last vet visit in nov (now 2yrs)
my muffie at eight weeks 4lbs and now is 8lbs (now 2 1/2) (well she preg now and weights about 10lbs)
the grandparents of the parents also have something to do with the weight

but the rule of thumb is like they said in the prev post