Figure out where and how you're dog is getting out and then dog-proof it, if possible. Years ago, we have a beagle who was a digger. She got out all the time. The solution was to make the digging impossible via cement blocks or other obstacles. Many years later, I had a beagle who was the total opposite -- instead of digging, she was a jumper, and boy, could she jump high. The solution there was to make sure there was absolutely nothing by the fence that she could jump up on. We had to pull everything back and make sure it was several feet away from the fence.