So this may be a dumb question but I have no idea if this is normal behavior from an older dog. So our 10 year old dog, Coco, that has never been around other dogs, besides neighbors behind a chain link fence, seems to have naturally taken well with our new 9 week old pup, he has not been aggressive towards him in any way and really seems to enjoy his company. But when ever Cash (new puppy) goes pee Coco runs over and tinkles over it. Is this normal, is he just making sure we all know that the yard is his? Sorry if this is a crazy question just unsure. Thanks.