Pets and emergencies

As I roamed the woods today with a bag of dog treats calling for my 2 golden retirevers to come home, I realized this would be a problem in an emergency situation. My dogs are lovaeable and fluffy, but also large and energetic. It is difficult to give them enough exercise daily in regular times without letting them run free for little while. Even so they don't always listen (like today) when I call them to come back. If I had to keep them in the house for a long period of time, that would be a problem. They would get restless and the younger one would start chewing things again. I also need them to listen better! I have been trying to train them to come when I call. In the house, that's no problem. However, outside with acres of land and the distraction of deer and animal scents, it's a challenge. Maybe I'll have to take at least the puppy to a class this summer when I'm done teaching. I was trying the call and treat method. I would let them loose, and call them back after a few seconds and give a treat. Let them run for a few seconds, call back and treat. Over and over again. It only works if I have treats. And they don't see a deer or groundhog. I am considering putting in a fence around a section of the yard to keep them contained when outdoors and not on the tie out line.