Species: capybara taur
Anthro above the waist, quadruped feral below, capybara taurs are characters built along similar lines as the classic centaurs of Greek myth, only using anthro capybara bodies above the waist in place of the human component and/or feral capybara bodies below the feral's neck in place of the horse body.
See also:
This tag implicates rodent_taur (learn more).