my jack russell terrier is 6 years old, and unspayed. Ever since she was a puppy when we are playing with her, and she gets over exited/we bend down to pick something up/she humps our arms/legs. She also does it to the cat! is it hormonal/sexual or something to do with dominance!? it used to be funny but she is getting older and she has a powerful grip! is it unusual for females to do this??
But its probably because we laugh
It is funny as he's about 2 inches taller than her (she's only 10 inches) so he just stands full hight and she falls off LOL.