It probably doesn't actually legislate "rights" to animals. What state, and what particular right do you have in mind?

Humans sometimes don't understand they had rights until they're taken away. There are many places that don't seem to have the communal ethos that would eliminate discrimination or assault or even slavery. When you start looking at Human Rights you have a huge subject in itself. I think trying to equate animal rights alongside human would result in a naturally bifurcated argument. They simply wouldn't stick together very well.

SRS