Portland is the largest city in the state of Oregon and it prides itself on being different. A lot of people consider it "hipster heaven," and maybe they've got a point- Portland has an awful lot of craft breweries and small coffee houses. But lots of people like craft beer and appreciate good coffee. Of course, not many people live in a city made famous by a sketch comedy.
Portlanders, as a group, tend to be mellow in the face of the unusual. They embrace it. Portland may be the largest city in Oregon, but at heart, it's a small town. People nod at each other, and will politely give you directions to the Peculiarium or the Vacuum Museum. They may even point you in the direction of the Vegan Strip Club if you tell them how Portland is so much cooler than Seattle.
One of the best examples of Portland embracing the quirky is Mount Tabor Park's Off-Leash Dog Area. Mount Tabor is an extinct volcanic vent that rises nearly 400 feet from the surrounding land. As you can probably imagine, the park is actually quite steep. So Portland turned the 200 acres of land into a park. There's an amphitheater, a basketball court, and lots of hiking trails. There is also a four-acre off-leash dog park.
The Mount Tabor Dog Park is, essentially, a small forest. It has everything you would expect in a dog park. There are plenty of poop bags and trash cans, there are benches for people, and there are water fountains for the dogs. There are even picnic facilities and shelters.
The only thing Mount Tabor doesn't have is a complete fence. The off-leash area is only fenced on three sides. The side that isn't fenced is a steep, near vertical drop-off that is covered in ivy. It is not very inviting for dogs, however, if your dog is particularly fearless, this could pose too great a temptation for her. You are the expert when it comes to your dog, of course, just be aware. Mount Tabor can be a challenge to someone who doesn't hike, but your dog will run her little heart out. And everyone knows, a tired dog is a good dog.