10. St. Bernard
St. Bernard is a breed of very large working dogs. They cost up to $3,000. St. Bernard is acknowledged internationally as one of the molosser breeds. They are very giant dogs, with long and heavy tails.
Their coat can either be smooth or rough. This breed’s growth rate is very fast. St. Bernard is a calm, sweet, patient, loyal, gentle, and affectionate breed. St. Bernard breed has a life span of 18–10 years. They should be trained and participate in events like tracking, search and rescue work. They can suffer from health issues such as elbow dysplasia, hip dysplasia, dilated cardiomyopathy, epilepsy, and Osteosarcoma.