For medium to large breed puppies you can get an idea of their adult weight by doubling his weight at 14 weeks and then adding another half of his 14 week figure (eg. your puppy weighs 15lbs at 14 weeks, so... 15+15=30 +7.5= total adult weight 37.5lbs)
Again for medium to large breeds, at 6 months old, your puppy may weigh around two-thirds of his adult weight. Giant breeds are more likely to be just about half of their adult weight at this age.
Puppy Weight Estimates - Get In The Ballpark Here
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