Blue Cloudy eye

Question
Ok, so I'm slightly freaking out.  All of the sudden, today, my dog, a 5 year old Shih-Tzu, is barely opening one of his eyes and it's a cloudy blue color.  The other eye is fine.  (Also, the eye that's cloudy was a regular blue in the first place)  He's very lethargic, and doesn't really want to eat or anything.  We can't take him to the vet till tomorrow afternoon.  I'm scared.  Do you have any idea what could be wrong, and if whatever it is will be ok till tomorrow?

Answer
Hi Danielle,

Has your dog received any vaccines recently? A reaction may occur in dogs, either after receiving vaccination for or after recovery from infectious canine hepatitis (Adenovirus-I). Most often one cornea will turn a cloudy, blue-white color due to edema (swelling). Vaccination with Adenovirus-II will help prevent such a reaction.

The cornea changing to a cloudy, blue-white color is common after prolonged irritation. It is seen more often in dogs with bulging eyes. The condition is called "Pigmentary Keratitis".
External irritants, "dry eye" (also called Keratoconjunctivitis sicca or KCS), trichiasis/distichiasis (irritation of the corneal surfaces), entropion (the lashes are turned in towards the cornea), corneal injuries, and chronic infections of the eye may all produce this result.

The Shih Tzu breed has several eye diseases that are genetic, including Keratitus, or inflammation of the cornea. Chronic low grade exposure keratitus leads to central scarring of the cornea and color changes on the surface of the cornea. They are also prone to dry eye, or KCS.

Please keep in mind that all the information I'm giving you is just guesswork. I'm not a doctor, and I haven't even seen your dog. You need not worry about all the things that may or may not be going on.
You're taking prompt action by having your dog seen by your vet tomorrow, and that's good! Yoyr dog wil be okay until he's seen by your vet.

Your dog knows when you're upset, so try to be calm for the sake of your dog.

Depending on what the vet finds, treatment may be as simple as giving your dog eye drops or an ointment. Other medication including including antibiotics, corticosteroids, mucolytics and hormones can also be used in treating eye problems in dogs.

Whatever the diagnosis is, make sure you understand how to administer the medication, and give the medication for however long it's prescribed.

Best of luck,
Patti