I have an overweight corgi named Ginger. She is a female pembroke welsh corgi and she is fixed. She gets plenty of exercise and playtime but she doesn't seem to be loosing weight. I have had her on many different dog foods such as purina pro plan weight management, science diet weight management and I tried wellness whitefish and sweet potato (she didn't like the fish). Now she is on science diet again and this time it is the small bites regular. What should I do? I really need some dog food recommendations for my Ginger.