Kaitlyn plays the character Cassandra Fay, the local vet, on Heartland. 8 août 2023 · Kaitlyn Leeb as Cassandra Fay on Heartland Cassandra was already pregnant before the proposal, which was made worse as she suspects Caleb to be seeing someone even when they are currently dating. But, Caleb was true to his word that he’d marry Cassandra.