Want to know if your dog is fit or not? In fact, there is a simple and clear evaluation method that I will introduce to you all.
BMI is a standard for a person's weight, and there is actually a way to measure their physical condition.
Body Condition Scoring (BCS), this assessment is divided into 9 levels, and it is illustrated with pictures and texts, so you, the owner, can clearly see whether your dog is fat or thin . 
1 - 3 > Thin to too thin
1) Too thin. Very prominent ribs, lumbar vertebrae, and pelvic bones, very little muscle, and no body fat.
2) Thin. Protruding ribs, lumbar vertebrae, and pelvic bones. Less muscle mass and less obvious fat
3) Slightly thinner. At the rib position, if you touch it gently, it will feel strong and boney without fat. You will see the shape of the top of the lumbar spine and the pelvic bone. The waistline and lower abdomen are obviously concave. 
4 - 5 > Standard Fit
4) Fit. You will feel a thin layer of fat on the ribs. The waistline and lower abdomen have lines but are not too sunken.
5) Standard. Similar to (4), the muscle mass and fat are slightly more than (4), and the waistline and lower abdomen are plumper than (4), but still clearly visible. 
6 - 9 > Slightly obese to obese
6) Slightly fatter. You can still feel the ribs but use more force and there will be more fat. The waistline and lower abdomen are less obvious.
7) Fat. There is obvious fat in the ribs, waist and buttocks, but not in the lower abdomen.
8) So fat. If there is too much fat, you must first feel the ribs, waist, lower abdomen and buttocks.
9) Obesity. No bones could be felt in the whole body, the abdomen under the waistline was protruding, and even the neck was swollen and buried.
Dogs that are overweight are prone to muscle loss and are prone to joint problems. The older they get, the more serious their joint problems will become. Because there are not enough muscles to protect the joints, the joints directly bear the weight of the whole body, making the joints more painful and reluctant to move. Later, there will be less muscles, and then enter a vicious cycle.
＜Diet to prevent arthritis＞
Providing a high-quality diet for your child can not only effectively manage the ratio of muscle to fat, but also prevent your child from malnutrition and toxin accumulation.
Slaves should note that the main ingredients in dry food are carbohydrates and there are additives. In addition to making the dog fat easily, they are also waste and harmful to the master. The plant protein in it has a low absorption rate and puts a greater burden on the gastrointestinal tract. Such poor-quality diet will only make the owner more susceptible to life-threatening diseases and aggravate arthritis.
＜What is the healthiest food?＞
Dogs’ intestines and stomach are designed to digest meat, so low-carbon, no-additive raw meat and bone food is the healthiest for dogs.
Good gastrointestinal function, enhanced resistance, easy to build muscle, more positive help with other body functions, will not cause the body to store excess fat, and reduce the chance of chronic diseases, such as joint disease, cardiovascular disease, etc.