Callaghan and her family were devastated, but two days after Bandit died, they got a sign from "doggie heaven."
"So my 15-year-old dog passed away two days ago," Callaghan wrote on Twitter. "My mom found his bowl like this tonight. Doggie heaven does exist. Love you, Bandit."
A picture showed water in the dog bowl in the shape of a smiley face.
"The bowl was a sign that he’s happy," Callaghan told BuzzFeed. "We even thought the smile looked like his. It was a God wink."
More than 30,000 people liked the tweet.
"It warms our hearts and makes us feel good about it," Callaghan said of the support that she and her family have received.