Here's why:
* Size and weight: Large dogs are significantly heavier than small dogs. Sitting on a lap would be uncomfortable and potentially dangerous for both the dog and the person.
* Physical limitations: The size of a large dog makes it difficult for them to comfortably fit on a lap. They might not be able to physically maneuver themselves into a position that allows them to sit comfortably.
* Social cues: Dogs, even large ones, often seek out affection and comfort from their owners. While sitting on a lap may be a way for a small dog to show affection, large dogs tend to use other methods like leaning against their owners, resting their heads on their laps, or simply cuddling up close.
However, there are some rare cases where a large dog might sit on a lap:
* Young puppies: Puppies of any size might try to sit in laps, but this is usually outgrown as they get bigger.
* Affectionate breeds: Certain breeds, like Labradors or Golden Retrievers, are known for being very affectionate and might attempt to sit in laps due to their love for their owners.
* Training: In some cases, a large dog might be trained to sit on a lap for specific purposes, such as therapy dogs.
Important note: If a large dog is trying to sit on your lap, it's important to gently guide them away. Their size and weight can make this dangerous for both parties.