What is the black moving spot in my dog's eye, seen when upside down?

Question

I'm very concerned about my dog,I would really appreciate if you could get back to me as soon as you can.He has a weird black looking spot in his eye.It moves around his eye and is very small.I thought it was extra pigment beacuse thats what my vet said about his eyes before,it's really strange beacuse you can ONLY see it when he is upside down(he sleeps weird)or hes in a weird possession.It doesnt seem uncomfortable and he's had it for quite a while now but I don't know if my vet knows anything. Pet's info: Dog | Dachshund | Male | neutered | 7 years and 1 month old | 16 lbs

Claudia Fioravanti · Accepted Answer

Hi, this looks like an uveal cyst which is a benign condition that can be easily distinguished from a melanoma by the perfectly spherical shape and by being translucent when trans illuminated during ophthalmic examination. Most uveal cysts generally occur without any precedent or concurrent ocular disease and originate from the pigmented epithelium of the iris or ciliary body. Theories exist suggesting the cysts are present at birth, but do not start to grow and slowly detach to become free-floating until later in life. As the cysts grow, they may become “wedged” in the visual axis and sometimes cysts collapse spontaneously, leaving pigmented deposits on the central to ventral corneal endothelium. There is no absolute answer to whether uveal cysts require treatment. In many dogs, single or multiple cysts may be present, floating in the anterior chamber, without any obvious effect on the dog’s visual behaviour. In your case, I would continue to monitor Oscar but given the fact the cyst is quite small, it’s most likely not causing him any problems with his vision even if it should move to the from of the eye and therefore can be left for the time being.

What is the black moving spot in my dog's eye, seen when upside down?

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