The American Society for the Prevention of Cruelty to Animals has seen a similar increase. In 2014, the ASPCA's poison control centers received calls on about 539 cases of animals accidentally consuming cannabis, up from 320 in 2013.
"What's worrying to us is the severity of cases now," says Dr. Heidi Houchen [3], a veterinarian at Northwest Veterinary Specialists in Clackamas, Ore. "We still see the classic case: red eyes, wobbly, urinating on themselves, a little twitchy ... but they can progress through the sedate, leaning, urine-dribbling stage to becoming completely comatose or absolutely rigid. They've come in and had seizures. They can come in a panic, really sensitive to noise and touch. They can pass away."