Laure Thompson, of Colorado Springs, was watching her daughter's dog, but after leaving the dog outside for a bit and coming back, the dog was gone.

She told CBS affiliate KKTV she "got on Facebook, posted everywhere we could. Humane society, Craigslist, then made posters and plastered them all around the neighborhood."

The dog was returned to the family's front porch early the next morning, and the Thompsons counted their blessings, but their relief was short lived when the dog started having seizures.

"His eyes were also rolled in the back of his head and his eyes were wide open," said Aiden, the dog's owner. Following an emergency trip to a veterinarian's office, they were told the dog had been given a marijuana edible and was experiencing a THC overdose.

Some non-active THC uses can be helpful to a dog's health in small doses, veterinarians told KKTV, but active THC is a different story.

"Usually they suffer from ataxia, which is uncontrolled movement, they are wobbly, pupils are dilated, some animals get really excitable, some fall into a comma, some will have seizures, there's usually vomiting involved, it’s not a pleasant experience,” Monique Brown, Patrice Manager of Pets First Animal Hospital explained.

The dog is acting normally now, but his owners are still trying to figure out what who would have taken him and why they gave him the edible.

In the event it was a joke, they have a few things to say to the kidnapper.

"Not funny at all, dangerous, scary.”