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Dennis Quaid is facing legal action from a horse rider who claims to have been seriously injured in an accident on the actor's California estate.

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Lester Wood, 70, alleges that the actor gave him permission to ride a trail on the Pacific Palisades property in Los Angeles, but he was thrown from his mount after the animal was spooked by a sprinkler system.

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Wood spent nearly two months in hospital after suffering injuries including a concussion, broken ribs, a shattered pelvis and internal bleeding, and racked up nearly $500,000 in medical bills.

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He has now filed suit against Quaid, who no longer owns the property, claiming the trail design was flawed, according to TMZ.com.