You'll have to see a vet or maybe a specialist, try the vet first. It could just be be cataracts, juvenile cataracts, PRA, dry eye, blocked tear duct, your dog may have a problem like cherry eye, entropian (eyelids rolled in), or distichiasis (extra eyelashes inside the eyelid) which is causing irritation to your dogs eye and now going blind or any number of things. It may be an ulcer (a poke or scratch) which needs treatment sometimes they don't heal right and sometimes an infection can build up causing the eye to pop out or explode. It may be extremely painful and need treatment and/or for something that is causing the damage to be corrected so it doesn't cause further problems. Sometimes there are things you can do for them to treat or stop the damage so your dog needs to be seen.
What breed of dog? Is eye color normal for the adult dog, like the blue eyes of a husky? How big a dog/ages of kids? Puppies will "nip" at anything, they have claws and so on. Any damage caused is usually a result of playing. Is child old enough to play with puppy? If a toddler, I would say no, both for children and puppies protection. If child is a little older,around 3 1/2 or 4, I would say yes. They can play together and the bond they make now will last for the next 15 years. Monitor their interaction and you make the call.
How old is your puppy? Sometimes puppies eye color changes as they grow, and blue eyes are sometimes there in Labrador pups, even registered ones. It's a genetic trait, that appears if both parents carry the blue eye gene. If the parents are AKC registered, you should ask the breeders to give you information on whether they have been tested for genetic disorders so you can be sure your pup is not carrying them.
Blue eyes in animals sometimes mean that the animal has a the propensity to go blind in the future. Some blue eyes animals are actually albino, which increases the risk. I would suggest you take your pup in for complete testing once he/she is six months old, unless it shows signs of visibility problems, pain or discharge from the eyes sooner then that.
Also, eye problems are not infectious unless there is discharge, or the eye is pink (as in conjunctivitis) so I would not worry about the kids.
My 3 year old rottweiler had an infection in her eye six months ago, which caused redness at the time and was given an antibiotic cream, a few weeks ago she developed a cloudy blue eye, when I took her to the vets he said she was going blind in her eye and he put it down to the previous infection she had, had. I do hope this is not your cause but do take your dog to the vets to get checked.
My dog is kind of a mutt, a mix between poodle, chiwawa and other dogs. She is 3 months old and we just noticed that her eye is light ish blue and she usually keeps it closed.
Normal its nuthing, sometimes the eyes will change color..but in some cases if one eye is blue and the other another color it culd mean yuor dog is deaf in the ear that the eye changed color I no it sounds wierd but its true..
Oh, my uncles dog has pupils like that and it looks freakin cool!!! Dude, just don't worry about it, it completely normal, maybe your dog just acquired an albino gene.
