4 Month Old Dog Weak Throwing Up ,diarrhea,vomiting,What's Wrong?

Sounds like parvo, very very contagious to other dogs, can be fatal. And needs to be taken to the vet right now. Call the vet, if it's night most vets will come in, they have an emergency service. It's not anything that will get better on its own. It needs to be treated than vaccinated!!! IT WILL KILL YOUR DOG! Don't wait.

Get your dog to a vet.  Now!!!!

Get to a vet ASAP, do not let this go on, if it's parvo you could lose your animal

Get it to a vet NOW because I just lost my 4 month old puppy today

Yea, my 5 month old pit ate some strange stuff, vomited yesterday and has been acting weak and sleepy ever since.... HE wont eat, but he will drink a little water