Why do people speak in a high-pitched tone to animals?

I think it's an extension of the way we speak to babies, sometimes called "motherease". With babies it actually does help them to concentrate on what you're saying and understand you better, and many of us treat our pets like children.

by Jennifer Muirhead

It is mainly due to excitement, you're so glad to see them :) It isn't intentional.

by Justine Crowley

To get their limited attention.

by jonaja

I'm not entirely sure. Probably just because they're so cute!

by Sarah Bell

I think it is called animal language and they pick up on the tones you use. The higher pitch - the happier you are! LOL

by chipp

This is such a good question.
I am very guilty of doing this and have no idea why! Perhaps when they are good, I think I once learnt to talk in high pitch, and my pets really are my children as children all grown up and gone!

by Finy