関連ワード:  why do dogs rub their backs on the carpet    why do dogs rub their backs on the grass    why do dogs rub their backs    why do dogs rub their backs on the floor    why do dogs rub their backs on dead animals    why do dogs rub their backs on the ground    why do dogs rub their backs on furniture    why do dogs rub their backs on their toys    why does my dog rub his back against me    why does a dog rub itself on you