Aww, poor baby. I don't have any experience with dogs in heat, so I'm not sure if that could be causing the issue. If you noticed it at the dog park, maybe it was an allergy to something around you? Grass? When Ruckus was a puppy he would get a rash on his belly from playing in the grass. When he comes in from playing outside I make sure to wipe off his paws and belly still. Your girl looks like she is covered in a rash....have you tried benadryl? You might want to call your vet and ask about it, but you can also find dosage information here http://www.englishbulldognews.com/co...d-their-dosage! I hope she feels better soon!