You get the most carbohydrates from

Unhealthy high carbohydrate foods include sugary cereals, crackers, cakes, flours, jams, preserves, bread products, refined potato products, andsugary drinks

Your dog can sniff at or even eat a bit of catnip. the herb is edible and not harmful. just don't expect them to roll around like a cat would! your dog may scrutinize catnip by licking and smelling at it, or be totally indifferent to this stimulant.