The problem is becoming so acute, last summer DoveLewis Emergency Animal Hospital in Portland, Oregon, issued a warning about pets on balconies - particularly dogs who typically suffer more than cats after balcony falls.
"Many times when dogs fall from upper-level windows their injuries are much worse - sometimes even fatal," Adam Stone, a veterinarian at DoveLewis, wrote in the release.
"Dogs typically sustain worse injuries than cats, and injuries from falls like this are more common in the summer."
In the release, DoveLewis included several tips on how to keep pets safe while they're on a balcony. Among them? Move patio furniture away from railings to keep dogs from climbing over them and never leave pets on balconies unsupervised.
But it's also vital to not mistake a balcony for a yard.
"It's not providing the same stimulation that outdoor time in the yard would," Hanson says. "They're not actually able to run back and forth. They can't chase after birds. Or patrol their environment to give them that sense of purpose that they're keeping their home safe."
"It's very frustrating for them. Because they can see the outdoor space," she says. "They can see people. They can see birds and other dogs. But they can't get there."