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.
Then remove it, and save it in an airtight container (a baggie will work) for use next time. If your dog takes a flea and tick oral tablet, or if you apply a monthly spot on treatment, remember to remove the collar when the day is done. You don't want to over medicate your dog who isn't at real risk.