As a general rule, if your dog doesn't wag its tail when the dog-walker calls round then be very concerned, Is its ears down and is its tail between its legs? All dogs get excited about going out for a walk. They wag their tails and show enthusiasm. Also, if the dog walker doesnt greet the dog with a hug and a warm welcome, when collecting the dog then be Very suspicious. Dogs are social animals and they know about human behaviour. So if they don't like the dog-walker then it becomes immediately obvious. Have a look at these