Red 40, Yellow 5 and Blue 2. Artificial food colorings are approved for use in both human and pet products. Food dyes make products look more appealing, more like what they are mimicking (e.g. a fake orange carrot treat) But are they good for your pet? No! Will your pet even notice? No! Food dyes are there to entice you as the pet owner into thinking the treat is more appealing. Don’t be fooled! Cats and dogs care about the taste and texture of their treats—-not the color! Artificial colors have been linked to an increased risk of allergies and cancer—please don’t give them to your pet. Food dyes are also used in pet supplement treats as well. All-natural supplements from Ask Ariel DO NOT contain any artificial colorings or dyes.