I was asked this in an e-mail today, and I thought it was a good enough question to share with the crowd: "I'm training for a half marathon coming up this October and want to keep my dog involved. She's a small dog, only 20 pounds, so I want to know - is there a time limit or distance limit i should take into consideration when taking her with me on runs? I want to get her energy out (so she'll stop barking her face off all day!) but I don't want to risk putting her in harms way. If there ... Read more »