Our vet recommended us to bathe our Boston Terrier about once a month but they said we can twice a month if his skin isn't dry. They also recommended for use to use only dog shampoo of a pretty good quality with moisturizers in it. We just purchased some Seargents and it works fine for him and was about 3 dollars for the bottle. We have had it since we got him and that was back in January. His skin dried out the very first time we bathed him but that was probably because he was such a little puppy and the shampoo probably irritated his skin a bit. He didn't scratch or anything though. I do only bathe him once a month though because he really doesn't roll in mud or anything like that (yet!) lol. Speaking of that..I have to bathe him today. He loves getting baths but he likes to bite on the towel when I dry him afterward..haha!