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29. Boxer
Boxers are another high-energy dog that require plenty of daily exercise. But even if you want an active pooch, Boxers may run up high vet bills. They are prone to many different medical conditions, such as heart disease, cancer, hyperthyroidism, hip dysplasia, neurological disease, and more. So for all their positive attributes, if you can't afford a bunch of vet bills, you shouldn't get a Boxer.