Dogwalking is a pastime and profession involving the act of a person walking with a dog from the dog's residence over a course of sidewalk or trail and then returning. Some people drive to a specific location to walk their dogs, such as a park. Dogs are walked with a collar around their neck, or a harness around their waist, which is less common, or by following their owner by familiarity and verbal control. People usually walk their own dogs or dogs of people they know. Dog walking may be a chore given to a child by their parents to demonstrate responsibility or to take care of a pet dog which the child initially requested. Professional dog walkers are people who are paid by dog owners to walk their dogs for them. These dog walkers usually pick dogs up at their residences by car and walk many dogs at once, always leashed. Some dog walking businesses require dog owners to drop their dogs off at their business which may also offer grooming, obedience lessons, kennel or veterinary services. Some businesses also offer dog and house sitting services similar to house sitting or babysitting. Some dog walking businesses must be licensed and have animal first-aid-trained employees. Some people may take dogs to parks that are specifically dog parks. Some of these parks have segregated areas for animals of various sizes, and some are exclusively for very small animals.