Mutant hound (Fallout 4)

Mutant hounds or FEV hounds are creatures found in the Commonwealth in 2287.

Background
These are dogs that have suffered major mutation from being exposed to the Forced Evolutionary Virus. Usually they are accompanying super mutants. It is most likely they were created in the FEV lab of The Institute along with the super mutants.

Biology
Mutant hounds are usually two times bigger than normal stray dogs. In addition, their hair has turned gray or is completely missing. The modification imposed on their bodies is similar to the one the super mutants went through when they were humans: increase of muscle mass, depigmentation of the skin to a greenish color and complete loss of body hair. The intelligence of mutant hounds seem affected too in the same way that a super mutant's is from the Forced Evolutionary Virus. This leads to thinking that these dogs were exposed to FEV as experiments inside the FEV lab of The Institute along with humans. They appear not to be in any way linked to the Master, as he was evolving only humans for his army. Super mutants seem to understand mutant hounds like no other in the Massachusetts Wasteland. Their vocal chords have evolved to create a very deep and low howl that they use to alert their nearby brethren.

Gameplay attributes
Mutant hounds will alert nearby mutants using a very loud howl. They deal radiation damage upon biting you. They normally come in packs of 1-3. They can also be tamed if one has the Animal Friend perk.

Appearances
Mutant hounds appear only in Fallout 4.