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Issue #20118: Lone Wanderer load screen incorrectly mentions dogs in addition to companions
Loadscreen PerkLoneWanderer: "Prefer to go it alone? With the Lone Wanderer perk, you'll take less damage and be able to carry more equipment when you adventure without a companion or dog."
The "or dog" part is wrong. All evidence points to Lone Wanderer intentionally allowing its effects to work if you have Dogmeat with you, who is obviously a dog.