Yes, they ARE contagious, but dogs like Lhasa Apsos have hair that grows in the ear canal that must be removed. If you don't remove the hair, then there isn't any air circulation in the ear canal and bacteria blooms and causes ear infections. You can remove the hair either by plucking it out (only a few strands at a time, and gently!) with some ear powder or trimming it out. When you get your dogs groomed you should ask that your groomer be removing the hair (a good groomer would be doing it without you asking) and thoroughly cleaning the ears.
The dogs need to have their ears cleaned about once a week with ear cleaning solution, and have the hair removed every three or four weeks, depending on how fast the dog's hair grows.
So it might not be mites, it might be dirty ears. =)
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