Here is a funny Birthday card from NobleWorks that won’t be soon forgotten. Everyone knows that when nature calls you have to go...You typically can’t hold it for a long period of time. I guess you could look at the steaming pile of dog poop in the middle of the floor as his personalized Birthday present to his owner. After all, it’s not like the dog can open the door and let himself out to do his business. Then again, if he can write and hang a sign that says, ‘Nature called’, maybe he can. Any dog-lovin’ friend will love this funny Birthday greeting.