Some dogs are wild, plaguing the wastes and killing livestock, but tame versions are necessary for many struggling wastelanders. There are also rare cases of domestic breeds that act as companions towards their bipedal counterparts. Humans and super mutants are the only species known to truly tame and domesticate these canines.
They are fiercely loyal to their owners. Before the war many of them had fur, but now many of them have lost it and their pink skin is visible. Some mongrels will attack on sight but can be pacified. There are a few different distinct breeds of dogs. Dogmeat for example, is a German Shepherd dog that may be a companion to the Sole Survivor.
Through the 200 years since the Great War, dogs have remained relatively unaltered by radiation. Other than that, there is no reason to believe that the biology of dogs in the Fallout universe differs from dogs in the real world, besides having a rougher appearance than domesticated dogs, unsurprising in the harshness of the wasteland.
Found in the Bradberton Amphitheater, these dogs are owned by the Pack. They will turn hostile if The Pack is attacked. These dogs can either be mongrels or junkyard dogs, and often have dog armor equipped. They can spawn battling in the cage fight arena against other entities, such as Pack captives, or be wandering around the amphitheater.
Finding armor on killed attack dogs, normally found accompanying raiders, will allow one to equip it on Dogmeat. However, no resistance is gained by equipping them.
Dogs can be caught for a settlement using dog cages included as part of Wasteland Workshop. Caught dogs will increase a settlement's happiness and defense levels. Mongrels, on the other hand, will decrease happiness and increase defense.
Some pack dogs are trained mongrels, while others are simply junkyard dogs.
There are 12 additional (non-follower) dogs available for purchase from the Creation Club: Black Labrador, Chocolate Labrador, Yellow Labrador, Shiba Inu, Rottweiler, Pitbull, Husky, Great Dane, Golden Retriever, Dalmatian, Boxer, and Border Collie.
There is also a device that can be bought from the Creation Club called a 'transDOGrifier' which gives four new coat options for Dogmeat as well as letting one change his breed to any of the above that have been purchased.