A Thestral is a breed of winged horses with a skeletal body, face with reptilian features, and wide, leathery wings that resemble a bat's. They are very rare, and are considered dangerous by the Ministry of Magic.
A dog collar is a piece of material put around the neck of a dog. A collar may be used for control, identification, fashion, or other purposes. Identification tags and medical information are often placed on dog collars. Collars are also useful for controlling a dog manually, as they provide a handle for grabbing.
The bordetella vaccination protects against canine kennel cough. Kennel cough is spread between dogs via particles in the environment and is similar to whooping cough in humans. If your dog is around other canines, at the park, agility course or elsewhere, it is recommended that he/she have a boretella vaccination.