I don't know about guineas for sure but I'm sure they tre as t most any critters with an Emergency.... One side is the Animal Emergency and Trauma Hospital and the opposite side of lobby and building is the Animal Eye Specialists so it's kinda confusing but everyone is very helpful and they understand that two different specialists in the same building is off-putting at first... I didn't know that when I went because I was in the animal emergency side and I needed the eye specialists, but 10 feet down the reception desk was where I needed to be. Easy.
I believe they do but you should call them to confirm
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