The attraction is opportunity, smell, and novelty
Your cat is not delivering a verdict that dog food tastes better in any lasting sense. Dog food is formulated to appeal to an animal with a different palate and is frequently richer and more aromatic than her everyday diet, and its novelty alone draws investigation that turns into eating. Size helps her too: a dog who grazes, wanders off, and returns leaves long unattended windows, while many cats eat their own portion promptly and then go looking. If the dog is fed in the kitchen where the household gathers, his bowl also sits in the social center of the home, on her patrol route, at the exact height she prefers. A well-fed cat with a thieving habit is usually responding to access, not need.
Why dog food cannot quietly become her diet
An occasional stolen mouthful from a healthy dog's bowl is unlikely to harm a healthy cat. Cats are obligate carnivores with requirements dog food is not designed to meet: substantially higher protein, the amino acid taurine, preformed vitamin A, and certain fatty acids in forms a cat cannot manufacture from plant ingredients. A cat filling up on dog food crowds out the food that supplies those essentials, and over months that imbalance can affect her heart, eyes, and coat. In the short term the richer, larger pieces commonly cause loose stools, vomiting, or a reluctance to eat her own dinner because she is already full. The traffic can run the other way too: a dog who finishes the cat's leftovers gets food that is too protein- and fat-dense for him as a habit. The goal is therefore not panic over a stolen bite but a household where each animal reliably eats its own ration.
Separating meals in a real shared home
The most reliable method is physical separation at feeding time rather than supervision and hope. Feed the dog and cat in different rooms with a closed door between them, or feed the cat up high where the dog cannot reach. Feed at the same times so neither animal is wandering hungry while the other's meal is served, and lift any uneaten food after twenty to thirty minutes instead of leaving the dog's bowl down as an all-day buffet; most dogs adapt to finishing at mealtimes within days. Where doors do not exist, a baby gate a cat can slip through or jump, a door strap that opens a cat-width gap, or a microchip-activated feeder that opens only for the dog's collar tag each create a barrier she cannot argue with. Keep the dog's food bag and storage bin closed and out of her reach as well, since a cat who cannot raid the bowl may investigate the source.
Making the new rule stick with every feeder
Separation fails when it depends on one person's vigilance. A partner who feeds the dog in the living room during a film, or a sitter who leaves both bowls down together, reopens the buffet and retrains the habit in a single evening. Agree the feeding map once — who eats where, when bowls are lifted, where each food is stored — and write it where anyone feeding the animals will see it. If she still hunts for the dog's food despite full meals of her own, look at her side of the equation: a bored indoor cat may need a puzzle feeder or play session before dinner to satisfy the hunt-catch-eat sequence, and a cat losing weight while stealing food needs a veterinary check rather than tighter doors. Set the separated feeding places and bowl-lifting times in KinsLe using Care Teams, so each feeder is assigned, the routine is identical every day, and her diet stays the one built for a cat.