My female dog would rub her ass on the lawn by putting her back legs up and pushing herself with her hands. Now I'm not sure if it was in an Erotic way or.... She really needed to scratch. xD
Back in the ol' days where we had a cat (pre-2000), that fatass trampled my keyboard (don't all cats do this?) and found an invincibility cheat for the game i was playing. It still amuses me today. :U