Humping!!

Mmmm ok guys Miss Ruby is 19 weeks shes started humping not exactly 'humping' but she licked my leg a couple times and did the  'humping 'movement' Told her off as in a No and she did!! Is this her little hormones LOL??? she will be 5 mths next Thursday!! We have been having a couple doggies from the neighborhood coming over a little Jack Russel (from i dont know lol)  and another small puppy about a year old that lives a few houses away in the last couple weeks!!!

could she be coming in heat? found this article might explain it.
http://www.pets4homes.co.uk/pet-advice/why-might-female-dogs-display-humping-behaviour.html

Could also be a dominance thing but my girls never did it

Was she over excited from play/walking at the time? Bug humps when she gets overexcited :/

No i dont think she was too excited maybe a little?? but shes done it a couple times before, she listens to the best of her puppy ability lol, dont think shes trying to dominate really, she gives the odd bark and growl when we stop playing with her!!