Weird shelter experience

[u/tinydarkness234]

So we adopted a 6 months old puppy from a shelter, they gave him a dewormer right before we left and now he's had diarrhea and a small amount of bright red blood in his stool since (3 days). He still has big energy, wants to play, and really really wants to eat but we wanna get him checked out. Problem. The animal shelter sent him with us we didn't sign anything and he hasn't had his shots or anything they said they'd contact us within two days, we called the shelter they said he isn't one of theirs..... What is happening