Just do it bit by bit and push all the buttons.. I know I do, ask abbie.
You'll want more interesting titles rather than horse 1,2,3 etc, partly it may not attract people, but more than likely you'll repeat names, which you did, and that really confuses the site.
I know you mentioned cowboy for horse which I think is OK, but don't list cow, cowhide, barn, etc those one would be spam.
You'll want better descriptions so we know and google knows what we are looking at. Even if you think its obvious.
If you can name the type of horse they are supposed to be you would separate yourself from everyone else rather than just keywording it as a horse.
----Mike Savad