Ok - this may come across as weird or gross, but I figured if there was anyne who would understand it would be you guys! Tucker (4 months) keeps getting behind Biddy (year and 1/2) and humping her! She doesn't seem to mind (that alone is making me look at her different!!

), but I'm not sure if I should stop them or not! It's grossing me out but is this a natural thing that I should just let them do??

Biddy is fixed and Tuck will be too in couple of months, but in the meantime should I just let them do their thing???