Dogs have a long and illustrious history of going to war with us for thousands of years.  The Egyptians, Romans, Celts, Persians, and many others have used them in battle, as guards, or as trackers.  The Romans especially were known for armoring their dogs and filling entire military units with them.  Their uplifted sentient descendents of the last couple centuries sometimes volunteer to serve in the military, carrying on that proud tradition into the present day.