Guild Wars 2

The wiki and all other pet locators say: Eternal Battlegrounds in Umberglade Woods,
but I have never noticed one there. Is it a low spawn rate?

They are there, I believe there’s at least 2.

They are north of umberglade woods.

You will see a group of wolves north of Umberglade supply camp, most of which are hostile and there are some veterans with them. In between them you will see the green juvenile wolves. I see them there all the time and often aim for them to run past the hostile ones without aggroing them.

I found one on my next pass through there.