This is often a symptom that they may have anal gland problems.
Some people have it done when their pets are at the groomers, others bring their pets to the vet.
If your pet requires more frequent anal gland expression, you may want to ask your vet how to do this yourself. I do this regularly for one of my dogs. Each time I tried it, it got easier. Now it's routine - when my dog thinks he needs his anal glands expelled, he runs and sits by my feet and scoots his butt along the floor. If you think your pet may have anal gland problems, please talk to your vet.