As a general rule you can feed 2% of your dog's bodyweight in food. However, these are only guides and other factors such as breed, condition and activity must be taken into account.
In order to switch from your current food start by adding in 25% of the new food and increase gradually until you have swapped over during the course of the next 7 days.
You can feed a mixture of both cold pressed at same time as raw as they break down at similar rates, however we do not recommend feeding raw food with kibble as it could knot in the dog's stomach.
You should monitor your dog's weight and adjust feeding quantities if required. Check with your vet if unsure.