Giant Ox

This giant Ox was a summon of Pain.

Appearance
With an appearance similar to a normal ox, this summon has a number of body piercings, along with Rinnegan, implying it was being controlled by Pain.

Abilities
This summon, by its sheer size possessed a great deal of brute strength. Also, because it has Rinnegan eyes, it possessed a field of shared vision with Nagato.

Itachi Pursuit Arc
It was first summoned during Pain's fight with Jiraiya, where it charged at Jiraiya, forcing him into some sewers. Once Jiraiya entered Sage Mode, however, he easily repelled it.

Invasion of Pain Arc
It was summoned again during Pain's attack on Konoha, where it was badly damaged by Naruto's Sage Art: Big Ball Rasengan and subsequently killed by Gamahiro.

Pains Stier