The fact that it's on concrete without a pad is actually a good thing. This means for starters you will need much less of the product you choose to treat it with effectively. You would need to locate and saturate all the affected areas. The key part is the locating all of it and treating all of it. Also, when you do the actual cleaning it will be easier to extract more of the urine than it would be in a padded carpet. So, actually this is much easier in my experience than cleaning a urine soaked padded carpet which sometimes needs a sub-surface extracting to effectively treat. I use both a good UV light and a moisture probe to find all the urine. Sometimes the urine will be easily visible because it's made a visible stain on the surface, but that is not always true and you have to do some work to find it all. I'd say 1/2 the battle with a job like you describe will be the locating of all the urine. I may use either an enzyme product or a peroxide based product with deodorizer. There are several of each on the market. I either apply it with a trigger sprayer, small pump up, or with a Hydroforce depending on how much I need or how bad the problem is. In an office setting I am very careful about what I will and will not move, really same for home settings. Unless the dog has just really gone wild in there this sounds like it would be doable provided to locate and treat all of the urine and rinse it thoroughly.
