How Often Do You Bathe Your Dog?

Ceasar Milan recommends to bathe dogs once a month but he bathes his dogs once a week. He says it is okay to bathe dogs more often than once a month for as long as the dog's skin is not dry. Since my dog always stays indoors I don't think much of bathing him. When I have plenty of free time, I bathe my dog weekly but there are times when I am always busy and rushing so I forget about bathing my dog altogether. My dog never stinks but that's not the only point of taking a bath is it. Does your dog have a bathing schedule? How often do you bathe your dog.