I have a male dog who has a slight urinary incontinence problem ( caused by surgery, there is not help) He wears the female dog diapers and they help, but not enough, everything seems to get 'off center, when he sleeps. I need to get baby diapers for him, but never having one I dont know how to figure size? He wears the XL dog diaper, its almost too big, the L was too small. He weighs maybe 45 lbs? Hes a blue heeler. TIA!! Heather and Dallas