I'm sorry Jessie, but I just couldn't help laugh when I read this, lol! Luke (our daughters chiuahuah boy) would do this around Lil Miss Maggy May before she got spayed. I wouldn't take my eyes off the two of them when I would let them around each other, didn't wanna end up with furbabies. Actually it was kinda easy to make him stop though, he'd go to get after her and I'd say in a stern voice, Luuukkkkke, no! And he'd stop right then and there. Luke is probably a lot younger than yours though, he's now only 11 months. I don't have any suggestions beside that teddy bear you spoke of,
(giggling here.) Not sure if you want to get him neutered or not, but if you do, that may help curb it some. Many people say it does, but we've had our boy Isaiah for 8 years, he's neutered, has been for years, and it didn't curb him from doing this at all around Dottie. Men will be men I guess, lol.