Hi James M-
Those tables on the back of bags are just guide lines. Every pup is different. I took a look at the dog food calculator on this site and it indicates that an average 12lb active dog would require approximately 446 calories. You are just going to have to keep an eye on him and increase the food if he is not gaining the appropriate amount of weight and decrease if he gets chubby. I’d add a tablespoon or so of high quality canned food to his kibble. Canned food is healthy and it often makes the dog feel fuller due to its high moisture content.
I bet he is adorable. I think Havanese pups are sooo cute! Have fun!
