Hardwood floor closet has smelled strongly of dog urine for 20 yrs!
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Bleach it first then vinegar with bicarbinate of soda in it then lemon juice should do the trick
If Allison's suggestion doesn't work, try Odo Ban concentrated cleaner. Beyond this, you may need to rip up floor and subfloor, and replace both.
I have always had great results from Nature's Miracle. they have an advanced dog urine scent and stain remover. You can buy it by the gallon for a little over $30. Pour it on your hardwood floor - it needs to be enough to seep through to the subfloor. Follow the instructions. You may have to treat it more than once. I hope you have as good luck as I have had. I bought mine from Drs Foster and Smith. They have an enzymatic cleaner for skunk odor as well which has worked great for me.
Why not paint the floor? You should prep and primer it first! Good luck!