In reply to jkarran:
Ours loves nothing more than to run, but time will tell if he will go for as long while pulling us.
He loves to sniff, but never stops running to sniff if he is running off lead. Sadly we can only let him off lead in a few places due to chase habits (although this is improving, we are still a long way off letting him loose on hills), which is one big reason for the canicross. (Mainly cos I want to ski with him if we get good snow. He will chase us down hill, as we are interesting, but we would lose him on the uphill! We can get him to pull up and chase us down I hope.) I guess maybe regular sniffing stops might help him to stay focussed. Thanks for that thought.
Due to his many issues, we are having to train lots of things to a high level, so although he hasn't fully got left and right yet, I'm sure he will. He is a bright wee thing