Small Dog Puppy Diaper Physiological Sanitary Pants Female Dog Shorts Panties Underwear Menstruation. The size of dog diapers is: M, suitable for puppies with waist circumference: 40~50CM and weighing 17.6~30.8 pounds Our pet physiological pants can effectively prevent the dog from mating freely caused to pregnancy during estrus. Our pet physiological pants are useful for the untrained. puppies, female dogs in heat and dogs that suffer from urinary excitement or incontinence. Pet Physiological Pants are an ideal way to help protect carpets, floors and furniture against damage, stains and odors caused by pet urine, blood and feces. Our pet physiological pants are made of high quality cotton, super soft and comfortable to wear.