York Regional Police are looking for witnesses after they say a dog was poisoned in Vaughan last month.

Coca, a six-year-old beagle-pug mix, became “violently ill” on Nov. 25 after eating pet treats scattered around a mailbox on Shawbridge Blvd, police said in a news release Thursday.

The next morning, Coca was too weak to walk. A veterinarian said her symptoms were consistent with poisoning by glycol, the ingredient found in anti-freeze.

Her condition deteriorated to the point where she had to be euthanized two days after eating the kibble.

Lab tests later found traces of glycol on the treats, which had been spread in an area about five metres around the mailbox.