A variety of materials can be used by your clients to bed horse stalls: Peat moss; shredded newspapers; straw; old, but clean hay; and any number of wood-milling byproducts including shavings and sawdust.
One danger occasionally hides inconspicuously among the fluffy, bouncy curls of wood shavings: black walnut remnants.
Horses that come into contact with black walnut byproducts usually fall victim to laminitis. Repeat: Usually, not might or could. The likelihood of laminitis is profound. Horses are extremely sensitive to black walnut shavings or sawdust.
Once bedded with black walnut byproducts, horses begin showing signs of laminitis in as little as 10-12 hours. Signs include reluctance to move, shifting weight from limb to limb, increased digital pulse and hoof temperature, and positive response to hoof testers. Unlike typical cases of laminitis, leg edema (at times significant), might be present.
“This is not classic nutrition-induced laminitis,” Crandell says. “Horses must only stand on black walnut shavings or sawdust to be susceptible to life-altering founder. They don’t necessarily have to eat them. That’s reason enough to be especially vigilant in selecting bedding.”
If horses are removed from the black walnut bedding quickly enough and veterinary intervention sought straightaway, recovery might be possible.
Black walnut shavings should not be used as bedding for horses, no matter how diluted they might be among byproducts of other woods.