In Montgomery County Maryland, it is easy to figure out if dog care/service business is legal or not. If you take your dog to a residential address, then that should be a red flag to you. Montgomery County or City of Rockville does not zone or license businesses in residential zoned areas. Another red flag is if the dog is picked up at your home and taken “somewhere” or to their “home”. The “business” should be able to show you their license issued by either the City of Rockville or by Montgomery County to prove they are a legitimate business. When you google places to board your pet you will find many illegal businesses with their websites listed ( probably more illegal than legal). In regards to your dog’s safety any insurance that an illegal company carries will not cover your dog because the policy is with an illegal business. The owner is fully responsible for harm done to their pet or damage done by their dog.
If you have questions contact Rockville City Police Department or Montgomery County Animal Control to find out where your dog really is.