Det verkar tydligt från Harry Potter böcker och filmer att djur (eller åtminstone vissa djur) har själar och kan bli spöken.
Medlemmar i Headless-jakten, till exempel rida på spöklika hästar:
Through the dungeon wall burst a dozen ghost horses, each ridden by a headless horseman. The assembly clapped wildly; Harry started to clap too, but stopped quickly at the sight of Nick’s face. The horses galloped into the middle of the dance floor and halted, rearing and plunging; a large ghost at the front, whose bearded head was under his arm, blowing the horn, leapt down, lifted his head high in the air so he could see over the crowd (everyone laughed) and strode over to Nearly Headless Nick, squashing his head back onto his neck Chamber of Secrets
och Mopsy Fleabert har skrivit en hel bok om animaliska spritdrycker.
Read more from Mopsy Fleabert about animal spirits and how to recognize them. Pottermore Wiki
Eftersom ett spöke verkar vara en funktion av att ha en själ i första hand, verkar det troligt att vissa om inte alla djur i Potter-universet har själar, inkluderade Phoenixes.