Hi there.  Bandit did not go through this so I may be way off base.  Could it be swelling putting pressure on him and making it difficult to go?  Hang in there Max.  Paw 5 from Angel Bandit and Deb

You definitely need to keep in touch with the vet - not peeing could be serious.  Of course, the dribbling suggests that it is not a blockage.  Male dogs sometimes have a hard time figuring out how to do it, especially if they lifted their leg in the past.  The first couple of times, I took my Otis right next to the house so he could lean on (ok, and pee on) it.  At times thereafter, I would let him lean against my leg (and yes, I got peed on a bit).  Eventually, he figured out how to do it, and how to pee without lifting the leg.  You might also want to consider how Max peed before - did he like privacy, go behind particular bushes, on a special tree (tree mail), etc.   Try to take him back to a favorite place if you can do so easily.   Once we figured out the balance (kind of) I ended up taking Otis out on the lead, but having to unclip the lead and turn my back so that he could do his business.  Once he was done, I put the lead back on and we went inside.  One member even took his male dog back to the vet office - the smells stimulated his desire to go and he went.   I think that member made two or three nighttime runs to the vet for potty purposes only.   There have also been some members who have had to go to the vet to have a catheter inserted, just to relieve the pressure.