Arugula — Food safety facts
Safe to share · Dogs · full breakdown on the linked food page
Safe in small amounts as a green treat.
The full verdict, portion guidance and serving notes are collected on the Arugula food facts page.
Short answer
Yes, arugula is safe for small dogs like your Chihuahua. The risk doesn't change with size — just keep portions small, about a leaf or two. Chop it finely to prevent choking and introduce it slowly. If your dog seems off after eating it, skip future servings and check with your vet.