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An Elizabethan collar, E-Collar, Buster collar or pet cone, (sometimes humorously called a pet lamp-shade, pet radar dish, dog-saver, or cone of shame) is a protective medical device worn by an animal, usually a cat or dog. Shaped like a truncated cone, its purpose is to prevent the animal from biting or licking at its body or scratching at its head or neck while wounds or injuries heal.

The device is generally attached to the pet's usual collar with strings or tabs passed through holes punched in the sides of the plastic. The neck of the collar should be short enough to let the animal eat and drink. Although most pets adjust to them quite well, others will not eat or drink with the collar in place and the collar is temporarily removed for meals.

While purpose-made collars can be purchased from veterinarians or pet stores, they can also be made from plastic and cardboard or by using plastic flowerpots, wastebaskets, buckets or lampshades. Modern collars might involve soft fabric trim along the edges to increase comfort and velcro surfaces for ease of attachment and removal.

Dangers of Elizabethan collars
The use of the Elizabethan collar has been shown to increase the amount of fleas in the animal compared to animals who do not wear the collar. This is apparent mostly in cats, since those that wear the Elizabethan collar have been shown to have twice as many fleas in their coats compared to cats that have been able to groom themselves.

It is also important for animal owners to make sure that the type of Elizabethan collars they use do not cause any allergic reaction to their pets, since some animals can be allergic to the plastic used in the most common clinical collars. Owners with plastic allergic pets could instead use other forms of non-plastic Elizabethan collars such as the inflatable collars or soft fabric collars.

Plastic Collar
Made of Low-density polyethylene, these collars are somewhat firm and do not allow the animal to reach an infected area by acting as a wall. These are usually secured to the neck of an animal by the use of a cotton padding roll through small loops at the base of the cone.

Soft Fabric Collar
Serving the same purpose as a plastic collar but being much easier on the animal, these collars are made of soft fabric and tighten through the use of Velcro. While it may be more comfortable, these cones usually impede the vision of animals more than the plastic version.

Inflatable Collar
Made with synthetic plastic that is suitable for inflating, these collars completely restrict the movements of the animals from reaching an infected area. These collars can be covered by a soft fabric, and unlike the regular plastic collar, these do not impede the vision of the animal. The collars are secured through the use of Velcro or through rope.

Cervical Collars
Mimicking the same Cervical Collars humans wear, these collars serve the same purpose of completely preventing the neck from moving or turning. These collars are the most restrictive type, and are mostly used for extreme situations such as grievous body injuries or neck injuries. the collars are fastened by the veterinarian, and owners of animals should only adjust the collars under the instruction of the vet.

Avian Spherical Collar
Made of medical grade polycarbonate plastic (Lexan), these cones are spherical and cover the body of birds instead of acting as a barrier like the other types of collars. These collars range in size to accommodate a wide variety of bird species. As this collar completely covers the body, birds wearing these collars are often grounded and unable to fly until the time that they are cured.

Injury or surgery
In Order to prevent the animal from irritating a wound or removing stitches while self grooming, Elizabethan collars are used to either prevent the animal from licking/biting its wound or using its limbs to scratch their head or ears. The collar can also be used to restrain animals with self destructing habits, either from poor training or mental illness.

Allergies or Flee Treatment
In addition to medicine such as ointments and pills, Elizabethan collars are necessary when dealing with an animal that is suffering from an allergy reaction. The main reasons are to prevent the animal from ingesting any of the medicine being applied on the skin, or to prevent them from harming themselves in the infected area.

Viruses and Fungus
In addition to to prevent the animal from harming themselves or ingesting medicine being applied on their skins, Elizabethan collars also prevent the animal from further spreading the infection due to it licking, biting, or scratching itself elsewhere after touching the infection area. Hot Spots, an infection that could be attributed to multiple reasons, are the most common infections that could be spread due to an animal licking or scratching the area.

Trivia

 * The collars are named from the ruffs worn in Elizabethan times. A U.S. patent was filed by Frank L. Johnson in 1959.


 * The 2009 animated film Up coined the colloquial name "cone of shame" for the collars, which feature as a minor plot point.