The happy dog pure mixed pack contains a selection of canned wet food suitable for dogs with food sensitivities or allergies one of the most common canine allergies is grain intolerance while some dogs also find it difficult to digest certain sources of protein most dog food contains more than one type of meat which in some dogs can lead to skin and coat problems itching and even diarrhoea and vomiting in order to prevent such allergic reactions each variety of happy dog pure wet dog foo