The black hard stuff is nothing to worry about. All dogs get some kind of eye-boogers - just like people do. :-) It sounds like he might have a bit of an infection causing excess tears that picks up dirt and results in black eye boogers.
You'll need to have your vet take a look at the eyelid, and will probably need some antibiotic drops to get it better. Don't let it go without treatment, or you'll end up with a bigger and far more expensive problem.
If this is a very young dog, ts possible you might be seeing an eye condition called "cherry eye". In any event, the dog needs to be seen by a vet, as Jaybay said. It could well be an infection and need treatment asap.
Copyright 1994-2018MedHelp.All rights reserved. MedHelp is a division of Vitals Consumer Services, LLC.
The Content on this Site is presented in a summary fashion, and is intended to be used for educational and entertainment purposes only. It is not intended to be and should not be interpreted as medical advice or a diagnosis of any health or fitness problem, condition or disease; or a recommendation for a specific test, doctor, care provider, procedure, treatment plan, product, or course of action. MedHelp is not a medical or healthcare provider and your use of this Site does not create a doctor / patient relationship. We disclaim all responsibility for the professional qualifications and licensing of, and services provided by, any physician or other health providers posting on or otherwise referred to on this Site and/or any Third Party Site. Never disregard the medical advice of your physician or health professional, or delay in seeking such advice, because of something you read on this Site. We offer this Site AS IS and without any warranties. By using this Site you agree to the following Terms and Conditions. If you think you may have a medical emergency, call your physician or 911 immediately.