Will butter hurt my dog?
There's nothing in butter that your dog isn't getting (in moderation) in their quality dog food.
A few licks of butter here and there won't hurt your dog, but large amounts lead to obesity or dangerous health problems.
It is safe for people, but toxic to dogs.
Yes, dogs can eat peanut butter as long as it is fed in moderation and does not contain xylitol, so get out that peanut butter jar and share the good news.
Generally, an adult average sized dog at 12 months of age, weighs about twice their weight at 4 months of age, or 2.5x the weight at 14 weeks.
Adult giant breeds grow more slowly, take longer to mature, and don't reach adult growth until they're at least 16-18 months old.
Generally speaking, small dogs should get no more than about 1/2 tablespoon of peanut butter per day and larger dogs should get no more than about 1 tablespoon.