Kris antu.
Bats use echolocation to determine where they are going.
Visible light is used to see things with. This is especially useful when driving, and when walking around the house without bumping into dogs or other things.
That probabaly means your dog has a eye condition.You might try to see a vet.
Firs it could be caused because of gripping things to tight or bumping your hands to much.
It could be because you just have the cursed bad luck that makes your head a target for the objects around you.
An accident - bump to the head - illness - tumor, alzheimers - age - go take him to a vet!
if only i knew! but try wearing things that expose skin, go to the pool if hes there, try bumping into him by accident then start talking to him (:
baseball, batting, bathing, bouncing, burping, beeping, bumping, branding, ......... dictionary!
Do things.
frat parties and drinking games
You could be allergic to it.