My oldest Grandson, who is now 18 by the way, learned to walk by holding on to the trim around my old 90 gallon saltwater community fish tank. We had a puffer we called Mr. Piggy who followed him everywhere he went. If Ian moved away from the tank the puffer sat in that same spot until he came back, then started wagging his tail just like a dog! I liked to lay in the living room floor and read my newspaper when I got home every evening, the puffer would get upset if I didn't pay attention to him and would spit streams of water out over the top and get me and the paper wet until I got up and fed him and paid attention.
I miss the puffer and wish I could have one in my reef. Just like a dog!