Although they have not been approved by regulators, marijuana-based treatments are being used not only for cats and dogs, but for pigs, horses and domesticated wild animals.

When Lisa Mastramico needed relief for her ailing tabby, Little Kitty, she turned to an unlikely source: marijuana.

At 12 years old, the cat had arthritis. For a long while she spent her days hiding in a closet, where Ms. Mastramico had built her a bed of plush blankets.

After trying various supplements that proved ineffectual, she went to a meeting for Women Grow, an industry group for cannabis entrepreneurs.

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Laura M. Holson ~ New York Times ~