It's definitely a rose.......and does not appear to be "sick" :-) Whether it can be considered a weed or not remains to be seen. Some species roses can be quite weedy.

The dieback could be something like winter injury, the missing leaves on still live canes deer browsing.

If a deer nipped that, judging by the thorns, that'd be a painful mouthful!

And it's definitely a rose of some sort - maybe a 'wild' one - rugosa?

Carol, I don't know how the deer manage the roses and blackberry with the thorns, but they do - with gusto. The local deer will usually leave the rugosa roses alone, really none of the others are safe.

Yes, deer loves roses. They may have analgesic substances in their saliva.

Friend on Camano Island reports hybrid rugosa 'Fru Dagmar Hastrup' is effectively hopeless because of the mule deer on his property eating the new shoots. Whereas Rosa moyesii 'Geranium' and Rosa nutkana are not bothered there.

I have spontaneous (growing natively) Rosa gymnocarpa and Rosa nutkana at my place on nearby Whidbey Island and have yet to notice damage to these.

Himalayan blackberry does seem to be a favorite in my neighborhood, which is useful as this is a major pest species. All they have to do with prickly plants is eat young leaves or leaf blades with prickles that have not firmed up yet. And stay outside of the zone of mature stems and leaf stalks with armature that has become effective.

There are flower buds in the photos. Can you post again when they open?

I see deer-chewed ends of wild rose all the time. Seemingly they're eating it while the thorns are not fully hardened.

Its a Hybrid Rugosa, and I have a hunch it may be 'Linda Campbell'

Without any flowers present it is difficult - perhaps even impossible - to come to any conclusion what cultivar it might be. I'm not even convinced it is a rugosa.

@gardengal48 (PNW Z8/9) Unless its a very distinctive cultivar. Some can be identified solely by their foliage/canes/prickles.