Probably only one or two lads i'd ever lend a dog to but i'd be very surprised if they'd ever ask anyway!
Bit different if you ask a friend to give a dog an opportunity your not able to, at that particular time, or maybe just keep the kettle boiling if work stops play. Either way, they are doing you a favour, not the other way round.
Most importantly, if your dog is out with someone else then you must trust them completley to act as you would, in the best interest of the dog and within that know absofuckinglutely, that if anything happened to that dog, then tough titty, hunting is a dange