Our boy is 9, and has developed some kind of yeast rash all over his abdomen (more so on his inner thighs and around his private area). I googled this, and it says it's very common in older bull mastiffs. It smells terrible! We are treating with a 50/50 water peroxide solution followed by anti fungal spray. I also read that it could be related to diet, and he's on a dry Salmon dog food (no grain).
Just curious if you have heard of this, experienced with your BM's, and what dog food you use.