Try your hand at DIY dog treats and freshen your dogs stinky breath by whipping up some homemade breath mints. Blend oats, eggs, water, coconut oil, parsley, and mint, roll out the mixture, cut into small shapes, and bake for 35-40 minutes at 325? F. Allow to cool completely before serving. Be sure to feed sparingly. Carrots and apple slices Carrots and apple slices are two healthy snack options for dogs, especially when it comes to teeth and breath. Crunching on carrots and apples can help prevent plaque buildup, and keep breath fresh.