Mommy noticed Thunder was acting strange and not using the letterbox. This earned him a emergency trip to the vet. He had a crystal blockage and was unable to urinate. He had to have surgery to insert a catheter and drain his blockage. He was reduced to the cone-of-shame for the week.
Thunder is since feeling better but there is new letterbox stress int he house and someone, we aren’t 100% sure who, peed under our beds and all over our stuffed animals.