Tell me what you would think if this happened to you and your dog.
You take kids to small park and secure dog to outside of play-park fence, along with your buggy. (It is no more than 1 1/2 meteres away, in full sight). Strange man walk along path and makes small talk with you (you are polite, but think he's being overly friendly). He sees your dog and approaches her. Your dog cowers to the ground (something she has never done with strangers before) and is very timid with stranger. Stranger keeps petting her and eventually she is waggy tail and happy. (I'm watching him like a hawk!) Stranger keeps petting her......for a full 5 minutes. He then starts ruffling around in his rucksack and I say 'she is on a special diet, so no treats.' He seems to ignore me and keeps ruffling only to say (to the dog) 'oh well, your out of luck anyways. I'm out.' He then keeps petting her for another few minutes until I'm getting kids in pushchair. (mind you, I'm not talking to him at all, he's fully absorbed with my dog). Finally get the kids sorted and dog sorted, and only then does he make to go.
Is it just me, or did me and my dog both get the heebie-jeebies from this guy?