Norma and Mark Schwartz Had a Dog in Their Co-Op

Norma and Mark Schwartz had a dog in their co-op, a violation of the co-op's no-pet rule. They promised the manager that they would make arrangements for the dog so that it was not living there, but each promise was followed by inaction. The manager would then warn again about the dog, another promise would follow, followed by inaction. The manager then brought an action against the Schwartzes for their removal from the co-op. Discuss the issues involved in this situation.