ASBO dog...

I can highly recommend running with your dog. I do a mixture of off-leash and on-leash, and my Boston Terrier loves it; it's really strengthened the bond between us. She's pretty fast, I have to say, and I'm sure a Border would be even better.
 
Our borders are quite laid back
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....but chasing the lurcher around the garden keeps them fit.
 
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