Yes, I was a teacher and school principal but became manic and lost one job and became
disabled and quit the other. I also don't know how you'd do it with a dog. Believe it or not, some kids are allergic. Plus, I don't know if a dog would be a safety issue. Maybe the district would think he might bite someone. (Even though you and I know that's not true.) Anyway, don't let anyone kid you, teaching is VERY stressful. I don't mean to be a downer just sharing my experiences.
My son got a degree in communications and is currently working at an insurance company. He does data entry and makes $22 hour. This is as much as my daughter makes teaching.
Just some things to think about. If you have your heart set on teaching, go for it, and I wish you all the best.