You need to make sure your dog is fully mature before running him/her long distances. The constant pounding, especially on a hard surface, will cause problems with immature dogs.

Big dogs are often not fully mature until 18-24 months. Smaller dogs mature faster. Be sure to get an OK from your vet before you embark on any plans to bike with your dog.

Oh yeah, and as the collie owner said, some herding dogs don't run beside bikes very well. They are HERDING dogs - so they like to cut in front of you. Hopefully, they won't nip at your tires!