It's hard to say. I think if you're concerned to maybe go and discuss it with your doctor and get a referral for a psychiatrist, though, if you don't already have one.

also I can say that seeing shadows from teh corner of your eyes is not hallucinations. Everyone has that. If you're seeing a lot of "floaters" in your vision or flashes of light, you should go to the eye doctor and get a full screening. That actually does have the potential for an eye health issue. I used to work for ophthalmologists a few years ago and those were signs to get an appointment.

The concern with your dog sounds more OCD than psychosis to me, but that's just my opinion.