My dad's Brittany is about a year old and is coming along nicely as a bird dog. However the dog runs himself to death when in the field. He doesn't know how to pace himself and usually looks like he is about to pass out after a couple of hours. What are some tips on teaching him how to pace himself? I know some hunters only hunt dogs in the morning or afternoon, but is there other things to get him to teach himself to pace himself so he will be able to hunt longer?