Welsh Terriers

Hello! I have a 10 month old Welsh Terrier, Kahlua. I have had dogs since I was a small child but this is my first Welsh Terrier. He is fantastic. I am concerned because he makes sometimes a 'rasping' sound not quite a bark but like when people clear their throat dryly. Whole days will go by without he making this sound. He is active, eats well but not much.I have had a series of big big dogs so am not sure what a small dog really should eat.I also would like to find a dog chart for WT. Can anyone help me? I would love to share information about Welshies. Thank you.