1. See if there are other animals invading their territory. 

Cats have a very strong sense of territory, especially male cats, and will take appropriate measures when other creatures approach their territory.

2. Being deeply attracted by some “moving” things outside the window.

If there are people and dynamic things outside the window, they can be found by cats and dogs, such as drying clothes blown by the wind on the balcony, look out for material bags or some small insects flying in the air, running on the road, such as cars.

3. The is to look out the window, but in it is to sunbathe.

Cats also have a strong sense of sunlight, especially cats. If the sun is shining outside, the cat will move to the window and in the sunlight.

4. During a cat's awkward period, looking out the window is to find a partner. 

Cats in the awkward period will be very hyper-emotional, with a lot of emotional ups and downs, and even irritability. Especiallly if the cat is not neutered, they will want to go out every day to find a partner out of biological instinct.

When the owner goes out, only cats and dogs are left at home, which will inevitably feel boring, so cats will squat outside the window to look at the scenery and pass the time.

6. Looking out the window is to wait for the owner to come home.

If the owner goes out and is not at home, the cat and dog will wait by the window for the master's return, squatting by the window can be the first time to see the master's figure.