Your dog eats faster when you walk past the bowl. Maybe they freeze, or growl, or flatten over the food when your foot comes near it. A month ago you could refill it mid-meal.
Safety note
If your dog has growled, snapped, lunged or bitten over the bowl, stop here and read Get help now. Guarding that has already involved teeth needs a person who can see your dog. Nothing on this page replaces that.
What this behaviour is
Protecting food is ordinary dog behaviour, and it gets more visible in adolescence as your dog gets faster and more confident about holding their ground. It is not disrespect and it is not a bid for status.
The sequence usually runs: eat faster, body over the bowl, hard stare, growl. The early steps are information, and they are worth keeping rather than punishing away.
Three things to stop today
Stop testing your dog by reaching into the bowl while they eat. Every test that goes badly rehearses the exact behaviour you are trying to reduce.
Stop taking the bowl away mid-meal to prove a point. Punishment-based approaches are associated with fear, avoidance and defensive aggression, and this counts as one.
Stop feeding near the front door, the crate exit or anywhere your dog cannot see who is approaching. A bowl with an open side behind it is easier to guard calmly.
Feed so approaching predicts more, not less
Walk toward the bowl from 10 feet away, drop 1 extra piece of food into it as you pass, and keep walking. Do not stop, crouch or reach in.
Repeat that at every meal for 2 weeks. Your dog learns that a person approaching the bowl means the meal gets better, not shorter.
Once that is easy, feed part of the meal from your hand first, then set the rest down and walk away. Coming from your hand and coming from the floor should feel like the same good thing.
If you have to move the bowl
Toss a handful of food a few feet away from the bowl first, and pick the bowl up while your dog is eating that instead.
Never reach past a dog who is eating to lift the bowl out from under them. Call them away with food, then lift it.
If children are in the house, feed the dog in a room with a closed door. A guarding dog and a small child at bowl height is a management problem, not a training one.
Reward-based methods are what the veterinary behaviour guidance recommends, and behaviour change is built from management plus reinforcement together, not one without the other.
Why testing them does not work
A review of aversive methods found them associated with worse welfare outcomes and no training advantage. Dogs trained with aversive methods showed more stress-related behaviour than dogs trained with rewards.
A dog who learns that growling gets punished may skip straight to a snap next time, because the growl stopped working as a warning.
Today's version, in one line: stop reaching into the bowl, and start dropping extra food in as you walk past.