The blood in the urine does seem like it caused by a UTI, stones or bladder infection. Did the vet take a urine sample???
I personally think that some foods can cause problems like that.
Years ago Raustyk was on purina pro plan when it first came out. It was a pretty decent food back then, Nutro was just barely emerging, innova and the like were not even available yet. For 3-4 years straight she would get UTI's literally one right after the other. About a week off antibiotics she'd get another one. She had other problems too, like her ears would get dirty very fast, I'd have to clean them out every 3 days or so otherwise an infection would start, she had a weird rash on her belly that wouldn't go away and her anal glands needed to be expressed every 1-2 weeks otherwise they would become impacted/infected. We did allergy tests, blood tests the whole nine, couldn't come up with anything.
I started to learn about better fodds that were coming out, nutro, innova, etc... and changed her diet to Nutro natural choice for large breeds because it was a better food. Within one week almost all of her problems dissapeared, within 3 weekd everythign was gone! A few years ago I ran out of dog food and was unable to get to the store so my mom went for me, picked up a small bag of proplan, sure enough her problems started to come back after only 2 days on it, then about a year ago again my mom went to the store and picked up a small bag of maximum nutrition from walmart and with 2-3 days a UTI appeared again. Come to find out the ingredient are VERY close to pro plan.
About 2 years ago I was speaking to a Nutro representative at a pet store & we were talking about the product, I told my story that I told above and she said that that was funny, she just had a customer come in w/ a toy poodle that had the UTI's on pro plan & purina one for years & went away within a couple weeks of being on Nutro. This got me wondering so I decided to a study on it.
Now purina one & pro plan are almost the same diet, there are only like 2 ingredients that are different and the shape of the kibble is slightly different.
So I went to the local vets office & a local pet store for 2 days each and out of about 400 dog owners, about 90 or so fed pro plan or one, and out of those about 45 all had one or more symptoms that were similar to Raustyk's. Out of those 45, 30 all had UTI's and out of those 30 about 25 switched foods (not that they knew about the food, just because they discovered better foods) and they ALL had all of their symptoms dissapear within a few weeks on a new food. (the numbers are close but not exact I don't have the actual paperwork with me but I have a good memory on this subject).
Sorry to make that a long story. lol
How much time laps between the time he slurps up water & goes potty in thge house? Does he go into a deep sleep after he drinks water but before he has an accident?
I would say he just couldn't hold it because as you said it just sort of leaked out while he was walking, not like he stopped & peed or marked his territory by lifting his leg. It could be that he over did himself and drank too much or it could be the start of a weak bladder.
I'd say to keep a close eye on him. After a big day maybe let him have a small amount of water but offer it frequently. Make sure to let him out shortly after. If it continues then I'd make a trip to the vet.
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and when she let them out Nebo dribbled on his way running down the stairs. I think next time Cisco comes over I'll just let Nebo drink a little bit at a time and see if it happens again. I hope he doesn't have a weak bladder or anything like that. 
He doesn't go during the night, in his crate while I'm at work, etc.
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