Dennis will sometimes do some very unexplained behaviour. I will try and explain it as best I can to you.... Out walking this morning and everything is going well then all of a sudden I can see his behaviour change (as you do when it's your own dog) it's hard to describe but his tail lowers, his head lowers and he starts to pant. He keeps running back to me and having a cry, then running ahead again. He was desperate to get home. Now we are home he won't settle and wants to go in the garden, back inside, upstairs, downstairs etc. and still panting. The times that he has done this before I have noticed is when he has been playing with another dog or when we went running (we don't anymore obviously) I'm sure I've heard somewhere before that Labs are deep chested... could this be causing the problem? Is it just his old age and I'm pushing him too much? has anyone else's dog had this problem? He is 10 now. I'm giving him a few hours to calm down and if nothing has changed I will of course take him to the vets. I'm just not even sure what I could tell them the problem was!