Though we love a silver fox, there are age limits for new policies. They are: Cats - 8 weeks to 10 years. Most dog breeds: 8 weeks to 8 years. Some dog breeds (listed below): 8 weeks to 5 years. Beauceron, Bernese Mountain Dog, Bulldog, Bullmastiff, Deerhound, Dogue de Bordeaux, Estrela Mountain Dog, Giant Schnauzer, Great Dane, Irish Wolfhound, ...