I have 3 dogs: Abby-7 month old mutt, Lucy - 1 yr old Saluki Mix?, Rudy-8 yr old GSD. Lucy is skinny and I would like her to gain a few pounds. Abby and Rudy both are good weights but will pig out and get fat if allowed to. Right now they're all on Nutro Ultra but I'm gonna swich them. I'm leaning towards Canidae but Wellness and Eagle Pack are also available to me. What do you think?