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Hello, and welcome.
I'm sorry that the changes in Bizou's eye have you worried. At this age, the changes your mentioned in eye color and pupil size may indicate an underlying medical condition which may be minor or more serious. For this reason, it would be a good next step to have Bizou evaluated in person by a vet as soon as possible, so you can get a definite diagnosis and he can be treated, if necessary. The following two webpages go over detailed reasons for the change in pupil size and in color, so you can look for any additional symptoms.
I hope you're able to have your furry boy seen in person by a vet, today or as soon as possible and once he is diagnosed and treated, all will be well!
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