Patronus shape in FB

[innermurk]

No: HPFGUIDX 55189

Hello.
I am very behind in the list right now having missed ten days during 
spring break, and then three more immediate snow days.
Forgive my lateness for posting this, but a while back there was 
speculation about the shape a patronus takes on. I believe it was 
tied into the discussion on whether or not Dumbledore knew about 
Prongs when he was talking to Harry.
At any rate, I thought everyone would be interested to know that in 
Fantastic Beasts....under the Lethifold entry, the wizard's 
patronus "caught the lethifold on his horns" (paraphrased as I don't 
have the book with me.)
This seems to suggest some kind of animal with horns as the shape of 
his patronus. So maybe an animal isn't that unusual for a patronus 
shape?
Except that Dumbledore said that Harry's patronus took on a most 
unusual shape.
Any thoughts?

Julie