I'm keen to start sledding with Blade... My question is, would a GSD be suitable? He has extremely good history in his lines with good hips - and he has good hips himself but, he is a 'slope back' GSD [from showing lines] and I just wondered if his build may cause him to either be weaker or prone to injury while sledding? Any experienced mushers here that could give advice? We just want to have some fun - no heavy compitition. Cheers!