First thing, try and have a good Thanksgiving.
Are you sure that he is doing it on purpose?
I know with my male dogs they will try and cover up each other scent by peeing over the others pee.
Also my first 2 dogs were a male and female. When Islander (female) would go for a pee, (especially when out for walks), Mack would sometimes lift his leg to pee so soon after her that she would get some on her back.
It is kind of gross, but not uncommon. Maybe let them out seperately to pee?
She may have the scent of another dog from the kennel on her?
A good bath may be in order.
Hope this helps.
Happy Thanksgiving