However, it was discovered that Boxers and a few other dogs could have heart problems
if they had a
taurine deficiency so dog food companies began
adding it to dog foods.
Ideally then, the protein source should be the first listed ingredient in a bag of dry cat food in a «maintenance» diet, followed by secondary protein sources,
if included, then whatever carbohydrate fillers are included, oils or fat, other ingredients, such as fruits and vegetables, a form of preservative, and
added vitamins and minerals, including
taurine.