I once went to a walk at 11 pm in the night. At one corner I noticed a few dogs barking. Being really afraid of dogs myself I didn't go much near, but I could notice that there were a few dogs in the vicinity, and one dog was constantly running after a bitch who was trying to avoid the dog but couldn't, and every once in a while the dog jumped on top of her whenever he could. Could you please enlighten me what was going on there?