Add horse hats. Either the placing of current existing hats on horses, or the much more cash-money version of exclusive hats for horses. This way you can slowly not run out of hat ideas for people/objects. After horses you can move onto cow hats.
Reasons this is a good thing:
1. Horses now have hats.
2. Horses kept in the shade of a hat.
3. Banter rights. Does your horse have a hat?
4. Poor people shaming is a social virtue.
5. More hat based intimidation.
6. Making a social hierarchy for horses is a good thing.
7. You've yet to make bird hats but release new birds.
This post is brought to you by someone who has never bought a hat.