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A. This could be a bacterial conjunctivitis. Dogs can pass these infections around, just like people can. The fact that it started in one eye and moved to the other suggests infection, but I can't rule out something more serious like glaucoma. I feel like anytime a dog's eye gets acutely red like this it's cause for alarm, and needs to be checked out as soon as possible. Like I said above, it's likely a simple eye infection, but get it checked out to be sure.
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