Why can't you translate this as 'Your cat is fatter than my cat'? Gros can mean big, large and fat.
I wrote "heavier" rather than "fatter" August 26. I think it, too, ought to be accepted.
I translated to larger..... you cat is larger than my cat....and it was denied
"Heavier" should also be accepted here... after all, some cats just look big ;-P.