Swarms of skeeters are biting horses, deer and cattle and leaving them anemic and bleeding under their skins.
The California Horse Racing Board requested the racetrack suspend racing for the duration of the season. Two additional horses died this weekend.
A lawyer says another horse crowded Maximum Security and may have clipped him, forcing the initial winner to "jump out of the way."
"Our souls and spirit were one," the singer and actress wrote of her stricken horse Arabella.
The "Legally Blonde" actress, who hasn't been able to ride for four months, was reduced to tears of gratitude.
Liam Neeson and Russell Crowe recently described emotional reunions with two "mystery brunettes" that are horses.
The state's famous herd animals know how to take care of themselves, experts say.