Hey Paul.....I think one of the links I gave you says 2-3% of expected weight, so you are underfeeding him. Understandable, it does get confusing, but at 4 months old he is very under weight, imo that is. You do not want him to balloon up tho, a lean dog is a much healthier dog, but, has your vet said anything about his weight? Anyways, what I would do is start off on a slow increase, if at all possible I would opt until 6 months of age to feed him 3 times a day, that way the increase wont overwhelm his body. If my math is right he should be eating a little over 1.5 pounds a day..... 3% of 55 pounds = 1.65 pounds a day, if you did 10% of current then he would be eating 1.8 pounds, and that may be just too much for a husky and a small one at that. You can see though with those 2 amounts they are very close in numbers...1.65 vs 1.8, those 2 options are what I have typically seen for puppies.
So what I would do Paul is go to 3 meals a day and increase to roughly 1 pound, or 5 ounces 3 times a day, for a couple of weeks. get his body used to the increase, then move up to 1.5 pounds or 8 ounces 3 times a day. If memory serves me at 6 months they should be 75% of adult weight, which would be about 40 pounds, I am thinking a good goal for Raiden would be 10 pounds increase per month, so at 6 months he would be around 38 pounds. However, you do not want him fat, and at this point it may be tough to know, little puppies carry some good ole pudge, haha, but at 6 months he should be in a healthy growth spurt, and at that age you should not see ribs or hip bones, but when gently touching him you can feel a nice layer of skin and fat and still feel ribs and bones.
My girl at 5.5 months old is 42 pounds, her end weight should be in the 70 pound range (she is a gsd) and she is considered underweight for her age, but to me she is perfect, because I can't see her ribs and bones, and no excess. Leaner dogs put less stress on their growing bones and joints, that's a good thing. My adult husky, is over breed standard at 65 pounds, and she is trim, no bones showing, but no pudge.
At 6 months of age, get an idea of his overall weight and look, and then adjust, you can at that time go to feeding twice a day until he is a year old and then make minor adjustments again. At 6 months I would still feed at the 3% vs 2% of end weight, unless he is too heavy, then go down to the 2%-2.5%. Everything is done with minor, gradual adjustments. Hope that helps.
