I giggled at the idea of a dog in the classroom, but I know these things are no laughing matter. 
We nearly lost my beloved Aussie to some kind of a stomach or intestinal problem this week. Our vet, Dr. Z and his staff pulled her through, but it was touch and go for a few days. Each creature given to us, horse, dog, cat, rabbit, or chicken, is a sacred trust. I honor this, and I value a teacher who would bring a kennel to her classroom. Good for you, girl!