“DOGMEAT” FROM FALLOUT 3 IS AN AUSTRALIAN CATTLE DOG
Dogmeat, the canine character in the Fallout video game series, was modeled after an Australian Cattle Dog. Here’s a description of the breed from the American Kennel Club:
As the name implies the dog’s prime function, and one in which he has no peer, is the control and movement of cattle in both wide open and confined areas. Always alert, extremely intelligent, watchful, courageous and trustworthy, with an implicit devotion to duty making it an ideal dog…The Cattle Dog’s loyalty and protective instincts make it a self-appointed guardian to the Stockman, his herd and his property.
Sounds like the perfect companion to have in a post-apocalyptic world. Click here for the full AKC description and here for more on the character at the Fallout Wiki.