A: Gray tabbies generally weigh somewhere between 9 and 14 pounds. Sometimes, when owned by the very lonely, who feed them a diet consisting exclusively of french fries, they get grow to be as big as 22 pounds.
A gray tabby should never weigh more than 22 pounds. Your cat weighs 37.
I am not solely concerned by your cat's weight, but also by her distended belly. It looks as if she has swallowed something large, bulky and solid.
Additionally, she seems to be making a ticking sound. In my medical opinion, that simply cannot be good.