If you feel that your dog is too thin, you should consult your veterinarian. They will assess your dog's body condition to either confirm your suspicions or put your mind at ease. And if your dog is underweight, it could be a sign of a larger health problem that needs to be addressed. Apart from starvation and improper care, here are the biggest reasons dogs tend to be underweight.
Poor Nutrition
If your dog is too skinny, one of the first things to check is that you're feeding them properly. Be aware that not all dog foods are created equal in terms of calories and nutritional value. Depending on the manufacturer and brand, one cup of dry dog food can contain anywhere from around 200 to 600 calories, says Tufts University. So while you might think one cup a day is plenty for your pooch, it's possible their food isn't meeting their daily calorie requirement.
Some commercial dog foods also use improperly balanced and/or poor-quality ingredients that don't provide your dog with adequate nutrition. Check with your veterinarian for their recommendation on a high-quality dog food, and be sure to check the number of calories per cup to be sure you're giving your dog the correct amount for their size and activity level. Ask your veterinarian if you're not sure how many calories your dog should be getting each day.