Every male dog has rectal glands. They surround his anus and are there to secrete a scented liquid in his poop. This scent is used to mark his territory just like his pee, however, the scent is far stronger. These glands are very important and can become clogged from time to time. When this happens, the glands may become infected or impacted. One of the first signs of this problem is your dog starts dragging his butt across the floor because it itches, or he may start chewing at the area. Once you learn how to clean his glands, you should be able to do the job in less than five minutes to prevent or correct problems and irritation.
The last thing your dog probably thinks about is his anal glands. That is, until they start to burn and itch. Then, that is all he can think about. If they become impacted it may make it hard for your poor ol' pal to poop. Unfortunately, if his glands do become impacted, he has to count on you (or his vet) to help clean them out.
While larger breeds may occasionally suffer from impacted glands, the problem tends to present far more frequently in smaller breeds. You can save your dog from a lot of discomfort by keeping an eye on his glands when you are bathing him or grooming him. Be gentle, take your time, and do everything you can to make your pup as comfortable as possible.