Is Hobbes a manx? I have two manx, one named Lola, and the other Toby. They're adorable and Lola is SO sweet. She will not leave you alone until you pet her.
I just did the same thing with Brewster and she came in at 8.8 pounds.
I think Hobbes is really a saber toothed tiger .
Are you able to get a picture of him standing next to an internationally recognised item, like a coke can?
Edited to add, your Hobbes weighs more than my full grown cat, my full grown minilop, my full grown dwarf bunny and my half grown dwarf lop all added together! LOL!!!