Today I took my 2 dogs for a walk. My younger dog is 15 months old. She is at the end of her second season and due to be spayed on 29th. A dog pounced on my dog even though she was on her lead and proceeded to mount her and I ciuksnt get him off her. The dogs owner ran away in the other direction and several other dog walkers tried to move them apart to no avail. My dog was very distressed but they were locked together for around 10 mins. I am very worried as it was obvious that mating had taken place. When the dogs owner came back he said he hadn't been spayed and that there was nothing he could do. Irritating as my 4 year old border collie was spayed early on to avoid this happening to other dogs. My younger dig is a spaniel/labrador. Any advice please.