I personally only schedule a meet & greet if they request it, because that only takes up more of my time and I'm not getting paid for it. I can't afford to spend time running around meeting people/dogs all the time, so I only oblige when requested. I've never had any problems handling it this way so far. I may change my policy in the future if problems arise, but for now, having as few meet & greets as possible works far better for me, but you should do whatever makes you most comfortable.