My puppy has discharge and a rash. Is it normal or a vet emergency?

It can be quite normal to have a little discharge from the penis in a young male dog, so what you are seeing with Zizou may be completely normal and not a concern. The rash may be something that needs to be addressed, however. It is difficult to tell from the pictures, unfortunately, as they are a tad blurry. The rash could be a local bacterial infection, possibly secondary to the discharge and the area staying damp. I would recommend keeping the area clean with a mild soap and making sure it is staying dry. You also could get an elizabethan collar (lamp shade collar) for him to wear to keep him from licking the area excessively and making it worse. Often when dogs lick a wound or rash, it keeps the area moist and can allow bacterial to overgrow further. I do not think this is an emergency and you can have our vet evaluate the skin when he goes Zizou goes in for an exam in 5 days. Based on how it looks at the time, he may need further treatment like a topical spray, or potentially antibiotics. Zizou is a great name by the way!!!!