ForTheBreed
Behaviour

How to introduce a dog to a cat

Rush this and you create lasting fear, injury, or a relationship that never recovers. Take it slowly and most dogs and cats can learn to coexist. And some become genuine friends.

ForTheBreed Editorial
Published · Updated

This guide draws on veterinary research, UK vet data, and PDSA/BVA publications. ForTheBreed has no commercial relationships with any product or service mentioned.

Before you start: assess the risk

Be honest about your dog's breed and individual temperament. A Greyhound that has coursed hares, a Siberian Husky, or a Jack Russell Terrier has instincts that are very difficult to override. This doesn't mean it's impossible, but it means supervision forever, not just during introductions.

Set up the home before they meet

The cat needs permanent escape routes the dog cannot follow. Install these before introduction day:

  • A cat-only room. Accessible via cat flap or door with a cat-sized hole, or blocked by a baby gate the cat can jump but the dog cannot
  • High-up spaces throughout the home. Cats feel safer with elevation; bookcases, shelving, window perches
  • Litter tray in the cat-only zone
  • Separate feeding areas. Cat food on a high surface the dog can't reach

This setup isn't temporary. It should be permanent in any dog-cat household.

Phase 1: Scent introduction (days 1–7)

Before the animals see each other, let them know each other exists through scent:

  1. Exchange bedding. Place the cat's bed/blanket near the dog's resting area, and vice versa
  2. Feed each animal near the other's scent item. Creates positive associations
  3. Rub a cloth on the cat and place it for the dog to investigate (not while the cat watches)
  4. Let the dog sniff the cat's room while the cat is elsewhere, and vice versa

Signs of calm investigation: sniffing normally, relaxed body, moving on. Red flags: obsessive sniffing, whining, fixating, refusing to move away from the scent.

Phase 2: Visual contact through a barrier (days 3–14)

Start with visual contact while the dog cannot physically reach the cat:

  1. Dog on lead, cat free on the other side of a baby gate or glass door
  2. Reward the dog heavily for looking at you rather than fixating on the cat
  3. Keep sessions very short — 30–60 seconds initially
  4. End before either animal shows stress
  5. Multiple short sessions per day beat one long one

Criteria to move to Phase 3: dog can look at the cat, look away, and take food treats calmly. If the dog is rigid, panting, whining, or unable to take treats, stay in Phase 2.

Phase 3: Same room, dog on lead (days 7–21)

  1. Dog on lead in the same room as the free cat
  2. Allow the cat to approach or retreat as it chooses. Never restrain the cat
  3. Keep the dog calm and focused on you, not stalking the cat
  4. Reward the dog for calm behaviour (lying down, looking at you, ignoring the cat)
  5. If the cat hisses and retreats. This is normal. Do not rush the cat to re-engage.
  6. If the dog lunges or fixates intensely. Go back to Phase 2

Phase 4: Supervised free access

Move to this only when the dog consistently ignores the cat or shows calm curiosity (not stalking), the cat moves around without fleeing, and both animals eat and behave normally in each other's presence.

  • Always supervise initially
  • Intervene calmly if chasing starts. Don't shout, it escalates
  • Cat must always be able to exit immediately

When to seek help

Get a force-free behaviourist if:

  • The dog fixates on the cat and cannot be redirected with high-value treats
  • The dog shows predatory sequences (stalk → chase → bite) rather than normal curious investigation
  • The cat stops eating, hiding permanently, or shows signs of chronic stress (over-grooming, house soiling)
  • You've been at Phase 2 for 4+ weeks with no progress

Some combinations are incompatible. Recognising this earlier. Before an injury. Is the kindest outcome for both animals.