Not necessarily
Picture from: Cat Research Institute @ Crazy Car Car Posing Photography.
Because the core question is:
Cats are not the same in length!
For example, people are 150 pounds, and their height is 155cm and 185cm, and there is a difference between fat and thin).
They are all 10-pound cats, with a body length of 50cm vs 80cm, and there is a difference between fat and thin.
For example, two cats with a 20+cm body length difference:
Picture from: Cat Research Institute @ 80 crazy car car, 60 good night.
When the weight is 10 pounds, the contrast between fat and thin:
Fat An'an. 
In the early years, the car was thin.
Picture from: Cat Research Institute.
Secondly, even if the body length is the same weight
The body fat ratio is also different!
For example, people are "thin", "fat" and "muscular, well-proportioned").
The same is 10 pounds, and there is a difference in the visual lines of firmness with more muscle vs fat with more fat.
For example, two cats with the same body length and the same length of their tails:
Picture from: Cat Research Institute @ 幺九家Ponyo & orange.
Also weighs 10 pounds, the overall line fat type is fat, and the muscle type is thin
Fat grows on the stomach.
The muscles grow on the thighs.
Picture from: Cat Research Institute @ 幺九家Ponyo & orange.
The difference in body fat ratio and fat distribution area is not only related to whether cats like exercise, diet and other Xi habitsIt is also closely related to the breed of cats!
Picture from: popsugar
Therefore,You can't blindly use your weight to assess how fat or thin your cat is
The scientific approach is:
Use the BCS (Body Condition Score) of the World Association of Small Animal Veterinarians (WS**A) to determine if a cat is overweight. According to the guidelines:
Can you see the cat's "waistline"?(areas of fat accumulation).
Can you easily touch the cat's ribs?(fat thickness).
Look at the waistline first
A cat of standard size——
Looking down, the waistline is not obvious, and the torso is generally oval;
Sideways, no fat on the abdomen, only a few fats.
Skinny, normal, fat.
Picture from: ws**a (click to enlarge).
If the cat is "spindle-shaped" as a whole and the middle part of the body is protruding, it is fat!
Back touch the ribs
Cats of standard stature, although they can't see the ribs, can be touched, and there is a small amount of fat between the ** and the bones.
Normal lean (loss of muscle).
Picture from: ws**a (click to enlarge).
This feel is very similar to the back of the palm of our little human hand. If you don't exert any force, you can feel the touch of the bones when you press it lightly with a little effort.
The tactile sensation is similar in these two positions.
Picture from: Tubing Britannica
Secondly, you can touch the back, shoulder blades, tail vertebrae, etc.
Best wishes for this issue:Shovel officer: Eat more and don't get fat
Kitty Success**
If you still have any doubts about having a cat
Feel free to leave a message
Editor in charge: lns
This article is the original of the Cat Research Institute, and it is not allowed to be arbitrary**.