I would ask what food you are feeding? that sounds as if the food is not right for a Bulldog. I wont go into it , but it is indicative to what the meat content is . please try Fromm, or natures variety,or great4 life. and yes rinse well. bulldogs must have clean skin to be able to stay cool they do not cool off by panting. so skin pores being kept clean and open at all times is a must. that is why I would never put a conditioner on the skin, and not rinse off well.
If you have a question regarding dog food, or behavior! call or e-mail me anytime.