Twice recently I've seen our 6 month old puppy (desexed male jrt x hound) cock his leg on a toy our 2.5yo greyhound (desexed female) has been playing with and pee on it. I thought it was a jelousy thing and scolded him for it and put him outside. Tonight he did it on her without her having a toy or anything of his. Any ideas what's going on? He normally squats to pee. It's only these 3 times I've ever noticed him cocking his leg. He was desexed quite young.