12 warning signs of cancer in dogs that every owner should know
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Weight loss is the number-one dog cancer symptom Dr. Zaidel says he sees. It’s often the sign of a gastrointestinal tumour. “I’ve had a lot of dogs stop eating because of gastrointestinal tumours, so they lose weight very rapidly,” he says. Cancer can also cause dogs to lose weight while maintaining their regular appetite. If you notice your dog shedding weight, either rapidly or slowly, make an appointment with your vet.