Ivy what u doing !!!

Can someone tell me y ivy is humping all the dogs she started it few days ago may I add Tillie mother in laws shih tzu Is here to she just keeps following any dog near and wants to hump she has never done this before lucky the others just walk off and ignore her but she really is chasing Tillie an Henry Maggie will not let such goings on near her. She even is doing a lil air jumping in the middle of the floor ????
Strange animal lol

My parents' shih tzu does this to the cat sometimes. The vet said he was asserting his dominance.

Roxy does this to rooney when rooney and pippa are playing to dominate.

She is really cryin and humping and now she started lil wees over the place and normally trying to do it on Maggie I know y she is doin it but how do u stop a blind hard of hearing 16 year old dog from doing it !