my horse bites his side frequently, is this a sign of a problem?

Have owned Horse 10 yrs, he is a TWH, 18 yrs old, ridden ~ 5 day/week, w/ westen saddle ~c 1 - 2 hrs / day on trail, at a walk; some gating at end of walk.

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Actioncameron profile image59

Actioncameron says

6 years ago
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renee21 says

3 years ago
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kcnck says

6 years ago
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