Ellie used to look out the window from the back of the couch all the time.
Then she would get into a barking frenzy and fall off.
Thankfully she didn't break her neck.
For her own safety we moved the couch up against a wall.
Now she goes up there but it is much safer for her.
She can't really jump off because of how the set up is but I'm sure she could make that size jump. I'm pretty sure she is a monkey.
Her poor knees.
But then what do you do? "No" doesn't work for long and she can't be held 24/7 either. We just try to keep the jumping to a minimum.