2.5 Year Old Australian Shepherd WONT EAT!

My 2.5 year old Australian Shepherd threw up last friday. He has done this type of throw up before (no food was in the throw up. Just mucus and little blood specs). I have taken him to the vet NUMEROUS times over the past months. The vets have no clue what is causing him throw up the mucus and blood specks. All his x rays and blood tests came back positive. He was prescribed on sucralfate and pepcid. It helped for a while.

Usually, after he throws up (in the morning), he will eat his regular dry dog food with no problem or hesitation. His behavior is normal, stool is good.

However, this time, he has no interest in his food whatsoever. He eats a few bites very slowly and reluctantly and just leaves it there. He has done this for 3 meals already. (1.5 days). He drinks plenty of water and stool is still great. I fed him sucralfate and pepcid as the vet described a month ago.

I have noticed that he wants to go outside WAY MORE OFTEN NOW. And while he is out there, he always secretly licks other dog's pee off of the grass or stop signs. This drives me crazy. He is definitely more restless than usual and more needy in these past couple days. He always whines and wants to go out.

I don't know if the non-eating is connected to wanting to always go out or wanting to lick other dog pee, but did anyone have a situation similar to this?

BTW. He is not neutered. I have to wait till mid week to take him to the vet.

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