Not quite the same in that in our case it was a pets as therapy dog in school, so not in class all the time. However it was still a right royal pain to manage. I can't say I miss it now the teacher with the dog has moved on. I'm not sure of the breed, but it certainly did shed. For us it was not just the allergy, but as he's had some nasty reactions in the past, the fear of having another is a huge issue for him.
Things which helped were things like bringing in a large fleece blanket for the dog and any children interacting with it to sit on. Once the dog left it was much quicker to pick up the blanket that find someone to Hoover the book corner. Things like trying to make sure the usual beanbags and cushions from the book corner stayed out of the way helped too, but didn't tend to happen.
The teacher kept one of those sticky rollers I her desk, and used it if she'd got covered in dog hair. They were not however prepared to de hair the rest of the class. I can see why, but it basically meant ds was afraid to play with anyone on the days the dog was in. In the end it was agreed that his class have their visit at the end of the day, so he didn't spend too long fretting. Ds had a change on clothes in school, should he need it.
Biggest problem was the school have a policy of not giving any medication which is not prescribed. Our GP in common with most in the area have a policy of not prescribing medications which are cheaply available over the counter, in this case antihistamines. It took months of back and forth, and I the end £45 for a gp letter before they would keep his medication in school. Even then, I don't believe they ever gave it too him. With the visit at the end of the day they never saw the full extent of his reaction.
If I could have chosen a school without a therapy dog I would, however he needs a specialist school which already limited us to two in the county, and it's increasingly popular here for schools to have a school dog.