I feed mine Taste of the Wild grain-free formulas (I pick different formulas off and on for variety) mixed with raw feeding. It's the most affordable grain-free that I feel comfortable with and they have done well on it. I had tried a higher rated food with grain but just didn't like how they gained weight on it and had more stool. The ToTW that I get at the feed store is about $46 I think for 30 pounds.
Anyway, I'd be very cautious about deciding to add 10 pounds to him. You say he is "probably" no where near 40, but be sure you weigh him first. My Tasha is 40 pounds and does not look it. She's a lean light dog. Second of all, what a lot of people think looks "too skinny" is actually a healthy lean weight on a dog. A study recently showed that over 50% of dogs in the U.S. are overweight or obese. That's a very sad statistic. Another study has shown that leaner dogs live longer. You can read more about that here: http://mullerveterinaryhospital.com/...ean%20dogs.htm
It's actually better to be a couple pounds under than over, especially as mentioned before on a breed with a long back and short legs. Ten pounds is actually quite a bit to add on in my opinion. I would also get his stool checked for worms before upping his intake.
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