I'm assuming that this is another Border Collie? :-)
Perhaps talking to Ceri of CSJ would help. They have quite a few different types of dog food in their ranges at prices to suit all pockets.
She can be very helpful :-)
http://www.csjk9.com/csjinfo.aspIt can be awfully difficult when you have a dog that is too skinny. All of mine were like toast racks on Burns and increasing the amounts or the number of meals simply caused it to come out the other end quicker :-(