Is there such a thing as a sex toy for a dog?

I have a nine year old black lab who for whatever reason has started humping everything in site after he eats his dinner. There is jiz staining all over my silk pillows which I paid a small fortune for. When I come home after work, I see stains everywhere. I do not want to ever hit my dog, especially for something that he can't help as it is his instinct, but is there such a thing as a blowup sex dog that I can buy him or anything else I can do?