I run my yellow lab 20 miles every saturday and over the summer a few years ago I ran him so hard that I had to carrie him back home for 5 miles. he just colapsed. I reccamend a book. I'm not sure what it's called but it has treatments for dogs. just about everything from A-Z. It might be called "The dog owner's handbook" not sure who the author is but it's well worth the money. I've saved over $200 on vet bills. I highly suggest picking it up.