"I've had numerous dogs we bike and run with, always herding breeds.I've had numerous dogs we bike and run with, always herding breeds."
This is very true, IMHO. The herding breeds will usually run right along side you and not stray. Hunting breeds and retrievers have a built in chase instinct that can take some work to override. The herding breads also are usually good runners.
Just remember, that when dogs run they generate a lot of heat and need a lot of water. Just be mind full of the temperature and the terrain. Rocks and thorns are bad for bike tires, but can be even worse on a dog’s paws.