Funny question here!

When we had a dog, yes, I would straighten her tail out just to see it curl up again. The only time it didn't curl up over her back was when she was sick or had been scolded.

My dog having very short (3-5cm) and straight tail since they born. This is natural for their breed. Why you want to straighten it? That's really funny

ha ha ha ha ha its impossible dear you can not strait the tail of a dog i don't know why.

I have never tried i dont think anyone else will try. How much ever you try tail never becomes straight. And yes few dogs dont have tail. I feel in tail no hard tissue or marrow is present so tail cannever be straight.

Interesting. I think the breeds that have a curly are naturally that way and the dogs with no tail were docked at birth.

It's really a funny question but i always find it interesting when it regards with dogs.before i make fun of their tail by straightening it coz i love the reaction of one of them, he will kicked me softly and crawl while hiding his tail and meaning he wants to play with me. But honestly you will never succeed in straightening a dogs tail coz its natural and if you do not want to look at it have it cut while the dog is still young and visit your vet for it.