I think the catch is whether or not it was labelled in the contract as a pet free daycare.

When I opened we were pet free. We still are. But it was not in my contract that we were or would remain pet free. Obviously if I knew a child was signing up had severe allergies I would try to make note of this and give lots of notice if we did decide to get a pet. But ultimately it wouldn't have been in the contract and I don't think there would really be any legal terms to act on.

Any chance that sitting down and discussing it with the caregiver would be of help to settle this. Ultimately the caregivers business is in their home and they are doing what they feel is best for their family. I do think the caregiver should be considering the impacts on the child with allergies and be forgiving the weeks notice. But there is a good chance the contract wasn't written in a way that requires it so should the caregiver really just not care then they may not have a way out.