The shelter in Philadelphia, USA, describes Mr. B as a 'big cat with a big heart', adding that he weighs a whopping 11.7 kilos - over treble the weight of an average cat!
The two-year-old short-haired tabby is looking for a new home and when the post went up three days ago, so many people tried to get on the shelter's website it crashed for a few hours.
Then, once the website was back up and running, the shelter was inundated with applications for the big fella. In fact, they've had so many enquiries they released a statement to explain Mr. B's next move.
'We are overwhelmed by the number of wonderful people ready to give Mr. B his fur-ever home. We are excited to find him a home soon, but he’s not quite ready to go home yet. He still needs a more thorough check up by our vet. We will announce as soon as he’s ready to go!' said the shelter.
Good luck Mr. B - we home you find a happy new home soon!