Polly eats Purina Beneful Healthy Radiance, and we've had no troubles at all with it. Lately, though, she seems more hungry than usual. We're still on a feeding schedule -- two cups, twice a day, which is the max for a dog her weight (75 lbs), according to the bag. She's always been a skinny dog, and I'd hate to fatten her up too much. She'll be two in February -- is it time to end the feeding schedule and let her eat what she wants? How do I go about doing that? Any suggestions are appreciated.