Most of the time they are large enough to be seen with the unaided eye. With a magnifying glass, you could see them easily. You may notice that your dog is scratching his ears a lot, or acting different. Your dog could develop a serious yeast infection. This can happen if he scratches, but sometimes it happens even if he doesn't.

If you dog has ear mites, you might see a brown discharge in or around his ears. Mites stimulate the production of ear wax in your dog's ear, so if you notice a lot of build up, you may want to check things out.

If you want to see for sure if your dog has ear mites, get a cotton swab and very gently wipe up some of the wax in your dog's ear. Examine this wax under a magnifying glass and you can easily tell if there are mites living in your dog's ear.

It is very important to get your dog treated right away if he has ear mites. Your dog's life will be made absolutely miserable by these creatures. Worse still, they can endanger your dog's life. They can cause rupturing of the ear drum, seizure, and death.

The mites are rather mobile as adults. It's easy enough for them to migrate from one animal to the next, infesting all your other pets. So you should make sure to check any other pets for ear mite symptoms as well.