A cow as a Pet?

So mum & dad what sort of pet can we get? Let's look for something different, something out of the ordinary. Hey how about a cow? Really? Or perhaps another farm animal like a horse, a sheep or perhaps a pig & her piglets?. Then again what about an animal of the sea like a whale, a penguin, a stingray or one of the sky like a pelican, an owl or singing birds? ....the list just goes on and on and on........ Or should we just settle on a playful puppy or guard dog? A comical tail (tale) of what animals make for practical pets and which definitely don't fit the bill!