If you ask me, I would say yes. At the very least, I’m sure our neighbor to the west would say "yes" since we removed part of our shared fence while doing our remodel. I have had a few fences built over the years and wondered when I did or didn’t needed a permit.
The City of Portland has a fairly comprehensive website that answers most of those questions. Also, I had been under the impression that you couldn’t build a fence over 6 feet in height. According to the website, it is a possibility but requires a permit and inspection.