thumper is dead right, Hormones be kicking into high gear soon. scent markers become very important this time of year, had a cat and used the litter box waste, was deadly on both cats , wolves and yotes.
I put the litter in a low draw, and sat above on the down wind side. was kind of a funnel coming up from river, Would go in evening and just sit and a 1/2 hr before dark would give a few howls
managed to get 2 yotes and a cat at this setup,
here is a link to Rich Cronks site
he has some good howling sounds on site person can listen too
http://cronkpredatorcalls.com/howlers hope it helps
paul