Hi my rottie is 14wks old and was weaned onto eukanuba large breed he has always been fussy and picky but he was ill and the vet gave us some royal canin sensitive stomach to mix with the euckanuba for a week and he ate really well but now he is better he wont eat it dry anymore should i persist or can i mix in other tinned foods as have run out of the vet one i just want him to eat the way he did last week,if i mix in tins what ratios of tin and euckanuba should i give and can anyone suggest what tins to try dont want runny poos etc