If there are animals in heaven, I think they would be animals which God made just for heaven. I doubt they are animals from earth, as I don’t think animals have a soul.
I could be wrong, but I think a soul is what makes humans differ from the animals. God breathed life into man. Animals were created for man to have dominion over. At least that’s how I’ve always seen it.
The creation account is pretty much what we have to go on from the bible. And it does use the same word for animal souls as is used for human souls. That doesn’t give them totally equivalent capacities, but it bespeaks some common feature.