wierd ear pain



In Dogs

Hi there - I am new to posting on forums so I hope I haven't posted this twice.  I have a 3 year old small active happy mixed-breed dog.  She has longish floppy ears.  She seems healthy and loves to play. However, on occasion when I am petting her head or playing with her ears she will yelp in pain and run away.  She shows no sign of ear infection (ear odor, hot ear, head shaking, ear scratching etc) - and her outer ear shows no sign of injury (cuts, lumps, scratches etc). 
Any ideas what this could be?

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