Why did my dog jump out of the window?
Assuming your windows are open and the object somehow flies out the window, your dog will jump after it because he is so focused on the object and is unaware of the danger posed by the open window. It is also worth noting that separation anxiety may cause your dog to jump out of the window after you leave.
Do dogs know not to jump off balcony?

Do dogs know not to jump off balconies? Most adult dogs will know not to jump off balconies. Dogs do understand heights, but there are risks with puppies or dogs with vision problems or when agitated. In cases like this, dogs can jump off balconies.
How do dogs know not to jump out the window?
Dogs are able to keep their odor detection & pheromone molecule analysis separate. The vomeronasal organ has it’s own set of nerves leading to the dogs brain that’s solely dedicated to interpreting those pheromone signals. Imagine how much information your dog is able to take in, just by having his head out the window.
How long does it take for a dog to recover from head trauma?

In some cases, the dog’s nervous system signs may worsen before improvement begins. The extent of brain recovery may not be obvious for several days. The dog’s full level of recovery may not be apparent for up to 6 months or longer.
What happens when a dog jumps out of a window?
Consequently, the full panoply of injuries that can occur as a result of blunt trauma must be considered when a dog has jumped from height. Broken bones are very common among dogs who fall from height. Dogs may break legs, ribs, the pelvis, and even their spine.
What happens when a dog jumps from a height?
Cats generally land on their feet. Dogs are less reliable in this regard, and any part of their body may make first impact with the ground. Consequently, the full panoply of injuries that can occur as a result of blunt trauma must be considered when a dog has jumped from height. Broken bones are very common among dogs who fall from height.
When to leave your dog in a room with a window?
If your dog has separation anxiety, don’t leave him unattended in a room with a window. And every dog owner should take special care on July 4, New Year’s Eve, or any other date (Lunar New Year is a big one where I live) on which fireworks are common.
What happens if a cat throws itself out of a window?
Those that hurl themselves out open windows may suffer significant consequences of blunt trauma. Those that crash through plate glass are at risk of significant lacerations and penetrating trauma from sharp glass shards. Cats generally land on their feet.