Athos
Athos was a beagle dog that lived in the 22nd century. 

Named after a musketeer from the Alexandre Dumas novel The Three Musketeers, he was the brother of Jonathan Archer's Porthos. He also had two other brothers, named Aramis and . Athos and his brothers were born to a female dog, owned by the mother of one of Archer's ex-girlfriends. ()
Dogs