We have a 2 yr. old spayed spaniel/border collie mix. She has a large (unfenced) yard to play/wander in but will still go out of the yard on occasion.
When she does go out of the yard it is to go into the pasture that butts up against our yard to look for rabbits/squirrels. Our yard on the pasture side has a defined 'brush' line and the pasture has a barbed wire fence.
What is the best way to teach her to stay in the boundaries of her yard?