Being inconsistent, believe it or not, is actually a great way to get them to come when you call - now that they know your call USUALLY means treats. Here's why. I call it the Jackpot syndrome. You can put money in a machine at the post office and get stamps every time, right? Yeah, but do you see people lining up to play those machines? Nope. Now think about the machines at a casino. People DON'T get a payout every single time. It's the randomness of the reward that makes it addictive. So give your girlies a nice payout at random, just often enough to keep them interested. Yeah, they're old enough to gamble!