Our new baby is Bonzie. He is a 15 week old fawn. I knew he would grow fast but this seems crazy! He gained 8 pounds just in the last week! He is currently at 42 pounds. He sleeps all of the time, really like 20 hours a day. We need to wake him to go outside and for walks most of the time. He is very healthy and has a good appetite. He is our fist boxer. I have always heard they are high energy dogs. Has anyone had a puppy grow this fast? Also has anyone seen a puppy's energy increase after a growth spurt? We would really like to take him to play at the dog park but right now the half mile walk there wears him out.