I like to have the canine assistants in the shop to help with projects.  I wanted a way to open the garage door, yet keep them from running into the street or from chasing squirrels in the front yard.

I think I have it figured out.

'Cattle Panel' sections from Tractor Supply - I cut
them into shorter lengths and connected 
them using chain links. 

A couple of eye bolts in the garage door
moulding.  Slip the grate over it and 
drop a piece of rebar through the 
eye bolts

Puppies stay in garage and have run of the back yard
(Doggie door in back of shop).