My dog has serious issues when it comes to certain metals. For instance, when people are wearing watches she clicks her teeth and becomes obesse with the metal if they take it off and hide it she is frantic to search to find it. She cannot wear her tags as she bent the metal and will stand there and go goofy over the metal until she is foaming at the mouth.

What causes this?

hiya sounds like it's turned into a game if people are hiding watches ect.
try using the plastic tags, and just ask people to remove the watch. do you think it could be the shinyness of the metal as well as the sound of the tags.
just try to avoid it being a game for her. i do know this will be hard work, but
try it as it may help her.
jessica one of my dogs was fasinated by plaster after we had the kitchen walls done. she'd sitr and growl at them for ages. so we removed her away from the kitchen, hard work again when the garden is through there, but she has no problem with the walls now. good luck. let me know how you get on

This is a 7 year old dog who knows how to play games. However, the metal issue is not a game. She will run up to people wearing certain jewelry and you must understand it is not just any type of metal it is certain metals. I just want to know what causes her to Click her teeth so loud when she is around certain metals.

[B]Clicking her teeth is her way of dealing with the metal. Can you recall why and when this all started. Then perhaps you can reverse the condition. Somewhere in her past she has had a bad reaction and someone over reacted to it. This installed the fear and frustration in her. If nothing works, I suggest a perfessional to come and work with her.
Good luck.B]

My dog does the same thing, just to different things. He's a Jack Russell/Rat Terrier mix. He has an obsession with trying to lick my eyelids when I get home from work. It looks really funny, his bottom jaw quivers and it makes a clicking/popping sound. I find it kind of creepy because I think he's actually getting excited (as in aroused).

Obsessive Compulsive Disorder in dogs, also called OCD, is a behavior that seems out of context, odd, and directed towards objects, be it the dog himself, or an inanimate object such as a food dish, or wheeled things like cars, bikes, or strollers.

OCD often manifests itself in dogs who are stressed, anxious, or bored, and can be a very maddening experience for the owner. These behaviors can often result in destruction of items, yards, angry neighbours, and seemingly uncontrollable aggression. Obsessive digging, continuous biting at their own feet, barking at nothing, attacking inanimate objects, all are symptoms of OCD.

When OCD is caused by stress, it is important to get help from your veterinarian. A stressed dog is also a potentially dangerous dog. There are medicated therapies available to help your dog deal with stress.

In boredom cases (digging, barking, tail chasing) it is time to step up your dog's activity level. A tired dog is a content dog, and not a compulsive pet. Get out and play more! Take long walks, look into Doggy Daycare, play fetch .. you get the idea. By expending your dog's energy on a safe, fun outlet, you not only ensure that your dog is happy, but you also increase your own bond with your pet.

[wishbone]

Nice explanation alpha.

When I search, i think this sickness sometimes called canine compulsive disorder CCD, their study is not yet concluded but says the treatment works on few case like licking, here's the link:

Obsessive - Compulsive Dogs