How do I know my border collie had enough to eat?

My border collie is 1 month old and I dont know if I give him enough to eat.

did he stop eatin eventhough theres food?

Here are the things that I look for in a commercial food::No generic fats or proteins Human grade ingredients Avoid foods that use corn gluten mealNo meat by-products or digest No BHA, BHT or Ethoxyquin No artificial colors, no sugars and sweeteners As few grains as possible Added taurineMeets AAFCO Specifications

See your vet to ask how much a month old puppy should be eating. Do you have the litter this puppy came from? A puppy should not be separated from its mother and litter mates until at least 8 weeks old.