I know there are horses in heaven. Lions will lie down with lambs, and God has promised us the things that bring us joy. #1 will be being in the presence of God...but we will still be ourselves, and as such, allowed the things that bring us joy.
I had a dream once, and I believe it was a vision. I was in a very high, large, light tower. There were no doors, just open windows all around the very large room I was in, and beautiful billowing curtains. I heard wild slightly discordant music, possibly bagpipes, but also violins and stringed instruments....it started out very faint and got louder and louder, and I looked out and in the distance (rolling green hills and high mountains in the distant) there was a herd of horses far away, running, and coming closer. As they came closer, the music grew louder and crescendoed until they ran past the tower, and diminished as they continued past.
It was a wonderful dream, and one I think was a vision of my home in heaven.