Thousands of dollars in donations have poured in to help locate the person who left poisoned meatballs at a park.
At least three dogs fell ill after eating the rat poison-laced meatballs. Eight meatballs have been recovered from the Boulder County park this week.
The Boulder County DA's office says one resident donated $1,000 for information in the case, and since then more donations have followed. The reward for the arrest and conviction of the person behind the poisoned meatballs is up to $3,500.
The meatballs are currently being tested by the Colorado Bureau of Investigation.
Distressed dog owners said they don't understand why someone would intentionally try to poison a pet.
"You don't do this if you're mad," Brandon Weil told sister station KCNC. "You tell somebody why you're mad, you don't just poison animals. You just don't do that."