It sounds like your dog might have either kennel cough
or canine influenza
Both of these are very easily picked up from another dog. They can also go into pneumonia which impacts oxygen levels making a dog quite ill.
You can see if some Robitussin DM will help the dog breathe better and control any cough or sneezing or runny nose. Read here about cautions and dose info
You can see and hear a dog with kennel cough here
If you see a colored discharge from nose or eyes, if your dog coughs stuff up, seems lethargic, has any real trouble with breathing, or goes off eating, see your vet as your pet may have a secondary bacterial infection that will need antibiotics or other meds.
Some breeds of dogs have problems with their trachea which you can read about here
However if this is an unvaccinated puppy this may be distemper virus too. You can read about that here
And it if its only his eyes that seem impacted this could be due to pressure on his brain from fluids, an eye issue such as glaucoma, or a painful eye infection.
If your dog might have gotten into anything toxic (including toxic plants), appears dehydrated (see if a pinch of skin over the shoulder blade stays stuck in a tent form or flows back down normally when released), has a rectal temp over 103.5F (normal is 100.5-102.5 Fahrenheit or 38 - 39.2 Celsius ), has gums or tongue that look white, blue, gray or yellow tinted where they are normally pink, has a slow color refill if you press on a pink area of gum or tongue, is having difficulty breathing, or is becoming more lethargic and non responsive to you as time goes on then you may want to get the dog in to see a vet. You can call your vet office to see if they give instructions on getting off hours emergency care.
This site may help you locate an emergency vet if you need one
Otherwise you may want to see your vet first thing when they open.
Hope this helps you!