Lester Wood, 70, alleges the `Day After Tomorrow` actor gave his permission for a trail to be used on his estate in the Pacific Palisades area of Los Angeles, but blames its poor design for a sprinkler system going off, spooking his horse and causing a number of injuries.

The equine beast reared up and over, landing on Lester and putting him a critical condition in a nearby hospital

According to TMZ.com, he suffered concussion, a shattered pelvis, internal bleeding, broken ribs, a nicked liver, a bladder tear, a torn meniscus in his knee, fractured lumbar discs and a fractured scapula in the incident, and claims it cost him $500,000 in medical bills during the two months he was in hospital.

Lester was not wearing a helmet and was looking at his watch when the incident happened.

Dennis - who was last seen in movie `What to Expect When You`re Expecting` - no longer owns the property and has yet to comment on the lawsuit.
sections: Celebrities