The short answer for a home that already has a dog
Most Greyhounds are genuinely good with other dogs. A retired racer has spent its early life kennelled, exercised and turned out alongside many other Greyhounds, so canine company is normal rather than novel. At home that background usually shows up as quiet tolerance: a Greyhound will share a room, walk politely beside another dog and then retreat to a bed of its own, rather than competing for attention or guarding space. For a household weighing up adding a tall, gentle sighthound alongside a dog they already love, that easygoing reputation is well earned.
Why size matching matters more than breed labels
The main caveat is not aggression but chase instinct and sheer size difference. A Greyhound stands tall and weighs far more than a toy breed, and a small dog sprinting across a garden can look, for a split second, like something to pursue. Most pet Greyhounds learn very quickly that the small housemate is family, not prey, but the first weeks need management: separate feeding spots, supervised garden time and no off-lead freedom together until you have watched them relax around each other repeatedly. With another medium or large dog — a Labrador, a spaniel or another sighthound — that concern largely disappears, and pairs often settle into a companionable routine within days.
Greyhounds also read other dogs politely. They rarely barge into play, which suits nervous or older resident dogs, but it can frustrate a young, boisterous dog who wants a wrestling partner. If your current dog plays roughly, expect the Greyhound to opt out and seek a quiet corner rather than join in, and give it a dog-free resting place it can choose freely.
How to run the first meetings
Start away from home on a parallel walk, dogs on leads with space between them, so they can see and smell each other without a face-to-face standoff. Let that walk end without forcing contact. At home, keep the first indoor time short and calm, with leads dropped only once both dogs are ignoring each other and choosing to lie down. Feed apart behind a gate at first, because even a placid Greyhound who has always eaten alone in a kennel may feel unsure about a new dog hovering near its bowl. Over the following days, widen access room by room instead of giving the newcomer the whole house at once.
Watch for relaxed signals — loose bodies, shared water breaks, choosing to nap in the same room — rather than a single good afternoon. If growling happens over a bed or chew, remove the contested item for both dogs and reintroduce high-value things only when they are separated; that is information about resources, not a verdict on the pairing.
Who this pairing suits best
A Greyhound fits best in a multi-dog home that is calm rather than chaotic, where the resident dog is steady and the owners can supervise the early weeks. Homes with cats or very small animals need extra, individual assessment from the rescue, because chase drive varies dog to dog and a good result with dogs does not automatically predict life with a cat.
When you adopt, ask the rescue how this particular Greyhound behaved in foster or kennels with smaller dogs, and keep notes from those first walks so everyone helping at home works from the same observations. KinsLe Transferrable Profiles supports that handover by moving the Greyhound's profile to you with its history, records and routines intact, so what the rescue learned about living with other dogs is not lost on adoption day.