A promising pairing, with conditions
Often, yes. Of all the cat breeds to pair with a dog, the Siamese is one of the safer bets, because the temperament points the right way. Siamese cats are bold, curious, and people-centred, and that confidence usually extends to a well-mannered dog. Rather than vanishing under a bed for months, a typical Siamese will watch the dog from a height, deliver a few opinions at volume, and then begin negotiating shared space, sometimes ending up as the household member firmly in charge of the dog.
Promising is not the same as automatic. The dog's character decides more than the cat's, and the introduction decides more than either.
The dog makes or breaks it
A dog who has lived calmly with cats, walks past them on a lead without lunging, and can settle on command gives a Siamese something workable. A dog with a strong chase instinct, a history of fixating on small animals, or boisterous, grabbing play is a different proposition, and no cat breed should be asked to manage that. Size matters less than self-control. A gentle large dog is usually an easier housemate than a small, snappy, relentless one.
Be equally honest about the individual cat. A confident adult Siamese or a kitten raised around dogs adapts readily. A nervous rescue Siamese with an unknown past may need a longer, more careful programme, and some will always prefer a dog-free home.
An introduction that respects the cat
Start with separation and scent. Keep the Siamese in one comfortable room with litter, water, scratching, and hiding options, and let the animals smell each other under the door and on swapped bedding for several days. Feed both near the door so the other's scent predicts good things. Move to sight through a baby gate or cracked door with the dog on a lead, rewarding calm behaviour on both sides and ending sessions while they are still boring.
Only when both animals can eat, play, and relax in sight of each other should they share a room, dog still on a loose lead at first. Never carry the cat toward the dog or place her in reach. She must always have a high route out, through a cat door, over furniture, or up a tower the dog cannot follow. Supervise all contact for the first weeks, and keep the dog out of her room when nobody is home.
Living together well
Shared life runs on small rules. The dog is never allowed to chase, even in play, because one chase rehearses the next. The cat's food and litter tray sit where the dog cannot reach them, both for hygiene and for her peace of mind. Give the Siamese daily one-to-one time away from the dog so the relationship stays her choice.
Write the stage you have reached, the signals that mean a session should end, and the room rules down where every walker and feeder can see them, because mixed messages undo introductions faster than anything, and KinsLe Family Sharing puts that shared plan in front of the whole household.