It all depends on the circumstances. Sure, we all know our dogs or at least we think we do, and when it takes a little longer to show signs we are looking for we say he's cold. I have that exact situation right now. I have a 3 yr old who is the only one out of the litter and he doesn't act like his half siblings at all. Does it bother me? NO, he may or may not come around only time will tell.