Looking at your dog from above, if you notice that the pup looks rather rotund and oval-shaped, it's likely that your dog is fat. If, on the other hand, you notice that your dog has a defined waist toward the rear and a straight build down the sides, then they're probably at a healthy weight.
How much my puppy should weight?
# of WeeksApproximate Weight820-26 lbs1231-40 lbs1645-59 lbs1850-65 lbs
How do you know if your puppy is too skinny?
How to Tell If a Dog Is Too Skinny1The ribs are clearly visible or feel like they lie just beneath the skin, with no fat layer in between.2The hip bones, shoulder bones and spinal cord are easy to feel beneath the skin.3The bones at the base of the tail are protruding.Is My Dog Too Skinny? - Hill's Pet Nutrition
Are puppies normally skinny?
Healthy Weight A healthy puppy is rarely overweight, but if his ribs show then he is likely underweight. You should be able to feel his ribs easily with your hands, but they should not obvious to the eye.
More useful articles on a similar topic 👇
How much should a 12 week old lab weigh?What weight should my puppy be?