That is a very naughty doggie.
I think he needs to be neutered….
Been humping a lot more than trees lately!
(Anybody else notice how much nastier-sounding 'neuter' is than 'spay.'? 'Spay' sounds like something you do with a garden hose but 'neuter' no matter how you phrase it still sounds like something painfully done with 'snips' and 'sutures'!)