And that led to an even more pressing condition: a shattered heart.
But, as it turns out, even that was treatable.
After The Dodo published Oso's story, the shelter received more than 1,000 inquiries about him.
Like so many chains of compassion, this one had many links.
Robin Barker, a volunteer animal rescuer, shared Oso's story on social media.
"I thought, 'Okay, we've got to work on this guy and get him out of there,'" she tells The Dodo. "That picture was heartbreaking."
From there, a group of animal activists began a flurry of networking, staying up until the morning hours trying to find a home for Oso. The chain connected Barker to Dana Hill, who worked her connections for much of the weekend to, at last, Sonia Anderson who ended up going to the shelter to pick up Oso.