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.
A canine spay is when the uterus and ovaries are surgically removed from your female dog, which is also called an ovariohysterectomy. This is performed prior to your puppy's first heat cycle, most commonly at six months of age. Veterinarians can chose to spay earlier, at six to 16 weeks old in some situations.