Owners who are too busy to walk their pooch during the day have been warned against passing their dog collar and lead over to just anyone.
Professional dog walking is one of the fastest growing industries in the UK but it is not strictly regulated, reports the Daily Mail.
In fact, the only requirement is that the dog walker adheres to animal welfare rules.
This means they can walk as many dogs as they like at one time - which can lead to a dog getting off its lead and running away.
Dr Roger Mugford, an animal psychologist from Surrey, told the news provider: "Dogs are sociable but there should be a limit of four for walkers.
"Dogs need to be controlled at all times and you cannot do that with six, eight or ten dogs. Owners should check out walkers before handing over a beloved family pet."
Dog walking traditionally involves a person picking up a dog from its home and taking it on a walk, then returning.
It began as a profession and a pastime so that the dog can get the exercise it needs during the day to keep healthy and fit.