“Well, I’m not a stupid teenager anymore. My Dog Reasons Why Dogs Hump and How to Stop It - The Spruce Pets 5+ Reasons Why My Dog Hump After Eating - petstutorial.com Finally you end the game and put it away. If a dog is not spayed, she will exhibit some out-of-the-ordinary behavior that may mean she's in heat. The first and most obvious reason for dog humping is due to sexual urges. 1.) (: Reply. Dogs Hump Toys my dog me after a shower on my period. Look for common behaviors of a female dog in heat including signs of amorous intent, such as raising her tail, pawing or playfully bowing. When you see a dog knotting another, smile; nothing terrible is happening, and everything is just going according to plan.