2. Weight Loss
Weight loss is the number-one cat cancer symptom Dr. Zaidel says he sees. It’s often the sign of a gastrointestinal tumour. “When cats are usually food-motivated but start to turn up their nose and don’t want to eat, that’s very concerning,” he says. Cancer can also cause cats to lose weight while maintaining their regular appetite. If you notice your cat shedding pounds, either rapidly or slowly, make an appointment with your vet.