I've noticed over the past week when I walk into my house I think I smell cat pee. Sophie is my only kitty and I have never had any litter box issues with her. Problem is I can't locate the source of the smell! I also seem to faintly smell it in my bathroom. After a couple days of sniffing on my hands and knees all my furniture/carpets I still can't find it. I tried in vain- knowing since I couldn't find the source it probably wouldn't help to spray febreez and white vinegar since I was having my parents over tonight. They said they couldn't smell anything upstairs. But they could smell it in my basement! I crawled around in my basement sniffing the unfinished floor and still couldn't locate it. We were in the basement because they had picked up a dehumidifier and we were setting it up. Hopefully that will help because my basement does smell a little musty to me- my parents say it doesn't. So I'm thinking, maybe the scent is traveling up from the basement? Seems to be strongest down there. Maybe it is traveling in the vents? Sophie typically does 3 small pees in a day and her litterbox has been true to that amount. My basement is closed off except for maybe 1/2 hr to 1 hr per day and I'm down there but can't watch her every second. Is there anyway to get rid of this mystery smell without finding it? I was thinking of basically ruining a mop and just mopping the unfinished basement floor.