What is the coneicalcollar that is put around a dogs neck?

I am sure I have heard the formal name for it, but at the moment, I can't think of it. They are commonly used to keep dogs from scratching themselves. It keeps their feet away from their head and neck. It also keeps their teeth away from much of their body. Many of the conditions causing dogs to itch, allergies, fleas, fungus, etc. take time to diagnose and cure if possible. In the mean time the dog can scratch itself raw. They are also used to protect incisions while they heal.

We visited the dog guide school school recently. Thought I would share some of what I learned. One of their veterinarians gave a talk on current hazards. Xylitol, a newer artificial sweetener finding wide use in sugar free gums, is very bad for dogs, see http://www.poynter.org/column.asp?id=2&aid=75125. The word on grapes and raisins being toxic to dogs has been around for a while, but new findings show some dogs are very sensitive to them, only taking a few to kill them. Her last point was bottle caps. Their sharp edges can cut dogs internally is swallowed. And like many other things, they can block the digestive tract. She had some nice X-rays of dogs that had swallowed all sorts of things. They fish the bottle caps out with a magnet. Other stuff, they have to operate.