A Pooka is a shapeshifter and can take any form it chooses. Usually, it is seen in the form of a horse, dog, rabbit, goat, goblin, or even an old man. Traditionally a Pooka is seen as a dark, sleek horse with a long wild flowing mane and luminescent golden eyes.
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Dragons eat horses. Are pookas really that powerful?
A pookas preferred form is a dragon 
I will occasionally take the form of an old bearded man as you can see 
So to answer your question yes they are 
Pookas don’t seem to ever find themselves in the form of a Nido. Seems I don’t meet requirements then 
Or a fish 
How can it take the form of a horse but not a seahorse? Sorry fishy 
I can kind of understand in my case it not being a purple, poisonous Rhino-like thing…
Or the monopoly man