<P> Thai Ridgeback puppy </P> <Li> <P> Thai Ridgeback </P> </Li> <P> Thai ridgebacks are a hearty, overall healthy breed with few inherent health issues . The breed has reproduced in Thailand almost exclusively by natural selection until the very recent past . The domesticated population is small . Inbreeding depression has not been observed in the breed . Thai Ridgeback Dogs are prone to dermoid sinus . Modern lines of Thai Ridgeback, resulting from interpopulation crosses, may also be prone to hip dysplasia and other genetic disorders . </P> <P> Thai Ridgebacks are an intelligent breed . The energy level is typically medium to high, with most of the day spent lounging and activity periods occurring in sporadic bursts . Well bred and properly socialized Thai Ridgebacks make loyal, loving family pets . They are naturally protective of their home and family and can be aggressive or shy when not properly socialized . They are best kept by consistent owners who have a thorough understanding of dog behavior . Because of prior geographic isolation and lack of human contact, the Thai Ridgeback remains independent minded and much of the original natural instinct and drives remain intact, particularly prey drive . Due to its nature, the Thai Ridgeback is not recommended for the novice dog handler . They have an excellent jumping ability and may seek to roam if not properly contained . </P>

How many thai ridgebacks are in the us