The main causes of white pupil crystal colour in dogs are: Firstly, primary cataracts in dogs. Secondly, because of the special metabolic function of dogs, when a dog is suffering from diabetes, severe hyperglycaemia, leading to the appearance of abnormal blood sugar metabolites, can lead to secondary cataracts. If you find that your dog has white pupils and crystals, it is recommended that you take your dog to the hospital ophthalmology department promptly for an examination to confirm the diagnosis of the disease.
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