No such thing as a dwarf boxer. Some of the other ones may have had more feeding time then the smaller ones causing them to be small, however given you stated an infection that could be a good cause.My boxers recently had a litter and two of the pups are small and healthy. They are six and one half weeks old and weigh about 2 to 2 1/2 pounds. Both parents are registered boxers. Has anyone heard of pigmy, dwarf or midget purebreds?