Although an immediate switch to Rockster should not cause any gastro-sensitivity for most dogs being fed a raw, home cooked or other canned food, we recommend a slower transition if in doubt. In all cases of solely dry or kibble fed dogs we recommend the following transition: Start adding 1 tablespoon of Rockster into each meal whilst subtracting 1 tablespoon of current diet. Over a one week period, transition gradually from 1 tablespoon to 100% Rockster or desired, continual mixing amount. Owners should not change abruptly from a dry diet to a purely wet diet.  If your dog has been only on a wet food diet it is possible to change more quickly.  Always ensure fresh water is available. There is a feeding calculator on www.therockster.com which is calorie based and specific to each recipe.  In general dogs require 2%-4% of their bodyweight per day.  Most dogs would be classified as “low activity” unless they are working dogs or having more than 3 hours of exercise per day.  The metabolism of dogs vary considerably and overweight dogs require portions to be reduced.