I have a dog walking business.
All our walkers wear body cams and all walks are put on our private page for owners to view if they want to. We have total transparency on our walks. Owners can see length of walk pick up times and drop off times etc. They can see how their dogs interacts in the small groups.
(body cams also protect the dog walkers from accusations from other dog walkers or owners)
We do not walk large groups ever not even on our own private land
The trouble is that it is pretty much an unlicensed way of making money.
I shudder when I see the way some dogs are transported by some dog walkers, their lack of training knowledge (we may not train the owners but we need to be able to train the dogs we walk for us and safety of others!) and lack of basic understanding of dog language.
If you are getting a new dog walker, ask to see their insurance, go out for several walks with them.
Try to walk with different groups.
Ask to check out their vehicles, ask about the type of crating in the vehicles and check it is crash tested.
Check they have first aid qualifications and check the qualifications - there are rubbish ones around.
Ask for references, ask what they do if the dogs do anything they dont like - a good way to see how your dogs will be handled.
Ask about size of group and how they work out who goes in which group.
Hopefully not just by timing and closeness of the dogs.
I personally would not let my dogs go in a vehicle on only seat belts.
Anyone who enquiries with us will be bored to death with me explaining all of the above. 