Board Thread:Theories and Speculation/@comment-26388300-20150523085628/@comment-734582-20150531201955

NejiHema wrote: I suppose Gaara's summoning beast is a racoon (like Shukaku), and when he enters Sage Mode , he would have eyes like Shukaku's (The first time I saw them I thought they were a doujutsu). While three Senjutsu locations are known, it's never said they are the only one. After all, Hashirama has unknown Sage markings and displays no characteristic summon.

Thematically, i think that a raccoon would indeed work best.