The pooch became sick earlier this week (begs17Jan11), so Jonas took his pet to a veterinary practice - and was told the canine would need an urgent operation.
In a post on his Twitter.com page on Tuesday, he writes, "Hey y'all. Keep Winston in your prayers and thoughts... He ate something bad and has to get surgery today."
The procedure went well, and Jonas updated his fans on the situation, declaring, "Successful surgery on Winston! They didn't find anything. But say he should be feeling better by tomorrow... Man that was scary!"
Greene adds, "Thank you to everyone who kept Winston in your thoughts and prayers. Little man has been through a lot!"