The problem that i am worried about is that when i am walking him out ON HARNESS he is pulling so much that he gets out of breath and is starting to loose his back legs, he will get up and keep following my other 3 dogs but today his back leg went into a spassam (sorry not sure how to spell that word) i am so worried i want to get him to the vets but cant get a appointment till tomorrow is this necessary to do this. Im not really sure where to go from here he seems to be the only one in my pack of four dogs that gets out of breath quickley.  I have had him vet checked and did ask him to check heart beat as i would like him in the future to pull the scooter alongside his mother.  Any advice would be much appreciated.  Thankyou..

I've no idea whats wrong with him, but I think you should get him to a vet ASAP.

how far are you walking him???  he is only a tiny baby and in my opinion a 15 week old pup should be having no more than 2 x 10mins walks a day on a lead.  my 14 week old sibe pup only goes out for socilisation classes etc and very does very little lead walking.  they get more than enough exercise at this age by charging and playing around in the garden with the others, they only need to go out for sociliastion at this age and should not be expected to keep up with 3 adults!
kelly

have you taken him to the vet yet? What did he say?  I have three 17 week old Siberian Husky pups, and they will walk their legs off if i let them - which i don't. Pups have all the enthusiasm as the adults, but without the stamina or strength. It's up to me to tell them they've had enough, if i didn't stop them they'd pull all day! I hope that's all that's wrong with your pup, please let us know how he gets on.

15 weeks old, have a feeling we are being taken for a ride, and not a sleigh ride either :D