Yep my bluetick let out a sqeaker the other day. I was petting her and she dropped down and rolled over so I would scratch her chest and beeevert! She had an utter look of happy on her doggie face. Not sure if it was the scratch, the fart, or a bit of each.
When I first got together with my companion we had a couple of chihuahua that slept with us. Sure enough there would be that tell tale smell and he would blame the dogs, later I found out it wasnt the dogs.