With a personality much bigger than their diminutive size, the toy fox terrier (TFT) is a fun and feisty breed well known for their charming and entertaining personalities. Originally created by the breeding of various toy breeds to the smooth fox terrier, like other terriers, TFTs still love the thrill of the hunt and are at their happiest giving chase to any small mammal willing to run. Though toy fox terriers have occasionally been described as headstrong and have been known to take control of a house, a well socialized and well trained toy fox terrier is a wonderful addition to many families. Still retaining tenacity from their terrier roots, their disposition is also tailored by the variety of toy breeds used to make this fine breed. Unfortunately, like other purebred dogs, the TFT has developed some inherited disease concerns along their path to the modern breed. Luckily, some of these diseases can now be prevented by performing genetic testing on dams and sires prior to breeding and by implementing selective breeding strategies based upon these results. One such genetic condition known to occur in TFTs is congenital hypothyroidism with goiter (CHG), a disease caused by a genetic mutation in ...