You know I was wondering the same thing! I give Mia a bath every saturday or sunday--once a week, but it looks like she needs it twice a week. We give her Merrick puppy plate and Zukes mini naturals as treats. I really don't know why her coat gets so oily. She doesn't stink too much but her coat gets very unpleasant. I have started to use conditioning sprays in between because I was afraid of bathing her more frequently since many people say once a week is enough. Mia looks so good after her bath I wish I could bathe her more.