Yes. This is a National Forest Service campground. Pets are welcome with the usual rules that they remain leashed and picked up after. The rules are here: https://www.fs.usda.gov/detail/wallowa-whitman/recreation/?cid=stelprdb5251602
Pets and Livestock
Pets must always be leashed (6 foot maximum) or under physical restrictive control in a crate or cage. [36 CFR 261.16 (j)]
Pets are not allowed in swimming areas. [36 CFR 261.16 (k)]
Saddle, pack, or draft animals are only allowed only in authorized as posted at the site. [36 CFR 261.16 (l)]