When dogs play, there is often a lot of role playing with dogs chasing and dogs being chased. One potential problem occurs when one dog is very eager to chase and the other dog is intimidated by the chase. How can a person tell whether both dogs are having fun?
One way is to simply look at the body language of the dog being chased. If the dog being chased has his tail between his legs, this often can be a sign that the dog is uncomfortable. Such dog may also try to hide between the owner or other objects in hopes of some respite. Also, when separated from the chaser, the dog may not try to re-engage in play.