dr. bartley harrison is a veterinarian with more than 15 years of professional veterinary experience treating dogs, cats, rabbits, ferrets, birds, and small mammals, with a specific focus on emergency medicine. tuna is a quintessential cat treat, and before the days of commercial cat food, many people used to feed their cats canned tuna. in moderation, tuna can be a healthy treat for most cats. although it’s fine to feed your cat small amounts of tuna as a treat or …