Wild rabbit urine???

I’m detecting the faint smell of urine in one corner of the master bedroom. It seems like it’s coming from under the house just in that area. The deck on the back of the house is under construction, and until I blocked it off, the crawlspace under the house was accessible to the dogs, who were chasing rabbits under there. I’m wondering if that’s the urine scent I’m picking up. It doesn’t smell like rodent, dog or cat urine; it smells more like human urine, that musty odor you sometimes find in nursing homes or on elderly people with UTIs (I was an EMT and worked in a hospital). But I can’t imagine there’s any way for it to actually BE human urine, given the location. (If a sewage pipe were loose, I think I’d smell way more than just urine, and I think those pipes are deeper than where the smell is coming from.)

Any thoughts on what it could be? Rabbit pee? I can’t think of any other critters that would be in there (no squirrels or chipmunks in that part of the yard). If so, how do I get rid of it? I can’t fit under there, although I could spray vinegar in the general area through some small openings or drop some odor sachets in there. If it’s rabbit urine, will the smell eventually go away on its own, or is it like cat urine that stays forever? What can I put there to discourage rabbits from hiding there? I don’t want my bedroom to smell like mothballs or coyote urine. But I also don’t want to encourage snakes under there by leaving the rabbits (I’m in the high desert in CA, so we get rattlers). Thanks for suggestions!