I was recently at the dog park near my house and there was another Golden there. I was talking to her owner and as we were talking she said her vet told her that at the age of 5 months, if you double their weight, that is the weight they will be as an adult. Does this seem right? If now, are there any other ways of detecting how big a puppy will become? Our girl is about 5 1/2 months old and I was just curious. Thanks!!