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5. Chihuahua

What this tiny breed lacks in size, it makes up for with its “big dog” personality. The Chihuahua may look fragile at first glance, but in reality, they're quite robust. Potential genetic issues include heart conditions, eye disease, idiopathic epilepsy, and loose kneecaps. Although these genetic issues occur within the breed, it doesn’t mean all Chihuahuas will develop them. Regular veterinary screenings, a healthy diet, and regular exercise are key to ensuring that they live a long and happy life.

tiny breed personality robust chihuahua knape / Getty Images

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