Running dogs together allows them that freedom to do what all dogs want to do which is to pull and to do it with a friend …the more the merrier! 
Getting them out into the world will give them the best education and owner can supply . They are great team players. 

The equipment I use is called a Diggler . Unfortunately they have gone out of business however dont flip out …You have several other companies to choose from . The trailer being pulled makes it possible to run to the grocery, go camping or a trip to the beach …In training I can place water in it for the dogs