Our dogs may be loyal companions, but we sometimes test their patience when we ask them to sit still for a bath or a nail trim. Some people leave this work to the experts—dog groomers that perform these services for a living. But what do dog owners need to know before taking their dogs to a groomer? Dr. Derrick Landini, owner and founder of the Animal Ark Veterinary Clinic in Chicago, offers tips on selecting a dog groomer