have a 13 month Black Lab who is from working lines and very lean. If I'm honest he could do with a touch (and I mean a touch more weight on him). He's currently on Arden Grange Sensitive which is grain free. Although he seems to be ok on this if I increase the amount even by 10g a day he gets a bit loose. I have read lots of good things about MW and am interested in moving him on. I have used their food recommendation guide but just wondered if there is a partic variety good for dogs who can be sensitivem I rmailed them to ask but they just sent me a link to food guide again. Be interested to hear people's experiences.