Even if they are good treats, you never know. One neighbor's dog get low quality food and treats and even though the treats I have are the very best, they make the dog sick because he is only used to having corn and junk. A meat treat upsets his stomach.
Another neighbor LOVES the treats I have and her dog knows me as that lady with the treats
I don't let other people give my dogs treats because what they think are good quality treats could be from Petsmart or the grocery store. I carry tons of treats and I hand them one of my approved treats to feed my dogs.