I’ve been trying to decide what mine would be and I’m thinking it would have to be a dog of some sort because I love them so much that I prefer them over most people I meet.
So I would either have a Chihuahua:
Or a Labrador:
EDIT: ok so I guess I am a Chihuahua, since the Lab pic didn’t cooperate.
Hm…Iunno. Hold on
/gets up, brandishes wand ‘EXPECTO PATRONUM!!!’
It’s a Lynx 
Expecto Patronum…
Leah’s gonna be PIIIISSED
Bison (American Buffalo). I just get that feeling.
FURRIES
I don’t really need to explain this, do I?
Expecto Patronum…
My Octopus patronus will make short work of yours…
First come, first served!
EXPECTO PATRONUM!!!
It swims! It flies! It has a giant beak!
I considered a penguin but I love its cousin as well.
EXPECTO PATRONUM!!!
Parseltongue isn’t just a language - IYKWIM 
Can your Patronus and my Patronus fight?
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I like to watch.
EXPECTO PATRONUM!
whoosh
My patronus would be an Irish Wolfhound. Big, tough, and strong, but sweet, scruffy and a little bit dopey.
Expecto Patronum…
… Well that was unexpected.
Depends, how good are you with Scourgify? IYKWIM
EXPECTO PATRONUM!
(if the Patronus is the embodiment of me…)
Or
EXPECTO PATRONUM!
(if its my kindred spirit…my kitty Ender.)
I believe I have footage of me casting a patronus somewhere. Let me find it…Oh here it is:
Yep, no photoshop at all…
Dude. That is awesome!!
EXPECTO PATRONUM…
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I grow to the size of a baseball, pinch like a mother-frakker (ouchhhhh!) and can climb trees. Don’t call me funny looking!