If you are concerned with how much you are feeding, then we need to know how large your puppy is, what his condition is, what his activity level is, and what you are feeding him. Different foods have different calorie contents. How much does the bag say to feed a pup of his age and weight?
Poop eating is not uncommon in puppies. It is a nasty habbit for sure, and stopping it is a good idea. If the dog looks otherwise healthy, I would not necessarily run him to the vet. Since he is very young, when was he last wormed. Keeping poop picked up and the puppy properly wormed is important for his health.
Jenna, RN CGC & Babs, CD RA CGC HIC
Heidi, RA CGC
SG3 Odessa, SchH1, Kkl1, AD
Ninja, RN CGC & Milla, RN CGC
Joy, Star Puppy, RN CGC
Dolly CGC & Bear CGC