Equidae

Horses and donkeys have never been shown in a Fallout game, but have been mentioned on occasion. Some equidae appear to have survived the Great War and only lived for a short time, before becoming extinct in just under or over a century onwards. One such case is Pugsley, a donkey owned by a man named Irwin who was killed when his ranch was attacked by raiders around 2161. The Chosen One when talking to Ethyl Wright however mentions abundance of mare's milk being around among tribesmen.

Scout Leader Jaggy also laments about missing the sight of horses in Appalachia.

In All Roads, the graphic novel, every NCR soldier seen in Chance's flashback of the Bitter Springs Massacre is riding a horse. Given the number of continuity errors between All Roads and Fallout: New Vegas it is likely this is merely another such occurrence.

In the Fallout: New Vegas add-on Honest Hearts, a sculptured horse head can be seen at the top of the war clubs.

A "Horse Marker" can be found in the G.E.C.K.

Horses are referenced to in the description of the Ol' Painless weapon in Fallout Shelter.