Not sure if I'd pay for the service, depends a lot on the cost. I'd like to say I'd treat it the same for a buck or doe. Most of the deer I've tracked have been does as I've shot way more of them than bucks, especially bigger bucks. This seems like it could be a good tool for when those blood trails dry up. As for crossing the property line, I agree with needing permission from the landowner first. When it comes time to cross the property line and you don't have permission for the dog, just leave the dog on your side. Some may use this as an excuse to cross onto neighboring ground to bump deer or check things out while "tracking". But at least they would need permission first to take the dog. I kinda think it may be harder for some to ask for permission to "track" with a dog than it would be for them to go ahead without a dog and say they were "tracking" later if confronted. Not saying nobody would ask to do it, as I suppose that may give the impression of it being more of a valid "track". You also may have some people that take the dog without gaining permission first with the excuse that they thought it was allowed, but then, they would be wrong and could be fined.