I think my puppy has an ear infection. She scratches a little bit and she has a terrible odor, although I can't tell if it's coming from her ears or not. What causes a 11 week old puppy to get an ear infection anyway?

Vaccinations and crappy commerical food are the first place to start to look. Read the article I wrote on vaccinosis - take your dog to the vet. If he recommend vaccination - walk out the front door and dont look back.

Take few minutes and learn about an all-natural diet. Use the site search engine here.

QUOTE from Ed Frawley: Read the article I wrote on vaccinosis - take your dog to the vet. END

Also, does your dog have allergy problems (again, often a result of grain-based "crappy commercial food")? I've had two rescue dogs in the past (lost both last November, at advanced ages) who had many allergies. The itchy-scratchies would break the barrier that the skin acts as.......and their less-than-great immune systems would succumb to all kinds of infections. One of them was already deaf when I got her from constant ear infections having thickened her ear canals to the point that there was no real passage open anymore. Both these dogs had their health improved by about ten million percent by diets of real food and desensitizing injections........

But my point is that allergies are one route to ear infections.

A bad smell indicates to me that the trip to the vet should be sooner than later.

From PetHealthCare.net:

What are the symptoms of an ear infection?
A dog with an ear infection is uncomfortable; its ear canals are sensitive.  It shakes its head trying to get the debris and fluid out, and it scratches its ears.  The ears often become red and inflamed and develop an offensive odor.  A black or yellowish discharge commonly occurs.

There are several kinds of bacteria and at least one type of fungus which might cause an ear infection.  Without knowing the kind of infection present, we do not know which drug to use.  In some cases, the ear infection may be caused by a foreign body or tumor in the ear canal.  Treatment with medication alone will not resolve these problems.  Also, the dog must be examined to be sure that the eardrum is intact.  Administration of certain medications can result in loss of hearing if the eardrum is ruptured.  This determination is made by the veterinarian and must be done in the office.

The results of the otoscopic examination and cytology tell us what to do.  If there is a foreign body or tick lodged in the ear canal, the dog is sedated so that it can be removed.  As stated previously, some dogs have such a heavy buildup of debris that sedation is needed to cleanse the canal and examine it completely. 
Cytologic study of debris from the ear canal dictates which drug to use.  Sometimes, it reveals the presence of more than one type of infection (i.e., a bacterium and a fungus, or two kinds of bacteria); this situation usually requires the use of multiple medications or a broad-spectrum medication.
An important part of the evaluation of the patient is the identification of underlying disease.  Many dogs with chronic or recurrent ear infections have allergy problems or low thyroid function (hypothyroidism). ....

How important is it to treat an ear infection?
Dogs with ear infections are miserable.  Their ears are a source of constant pain resulting in head shaking and scratching.  However, that is not the only problem.  Head shaking and scratching can also cause broken blood vessels in the ear flap, requiring surgery, and chronic ear infections can penetrate the ear drum and result in an internal ear infection. 

She's been on the raw diet since the day I got her. She's not scratching that much and definately not "miserable". I'm thinking infection isn't it. I'm keeping a close eye on her and will definatley take her to the vet if there's any more symptoms. The odor isn't as bad this morning as it was yesterday, and I'm having a hard time determining where it's coming from. I put my nose in her ears and it's not from there. Further inspection is warranted.

QUOTE: I'm keeping a close eye on her and will definatley take her to the vet if there's any more symptoms. END

You're there and (obviously) I'm not. For me, "terrible odor" from the head/mouth/ear area means an immediate trip to the vet.