Im not as familiar with doggy day care places since we have been home a lot for this year, but you can bring your dogs to campus with you! Each class has a homeroom where you can keep your dogs (assuming they are vaccinated and well behaved) while you are in lecture/lab. The process for that will be set up by the class presidents in the fall.
For horseback riding sessions, I know that there are courses through the school for different experience levels and a handful of my friends are currently doing them and were able to apply for a tuition waiver so it didn't cost them anything.
Horseback Riding Lessons There are also loads of barns in the nearby area where you can do lessons. I would recommend posting these questions on the FB page if you are on it because a lot of current students will be on there ready to provide their insight!