UTIs are not contagious and it sounds like you are doing a good job keeping the box clean. If the cat was still smelling the urine and hasn't done it again since you cleaned the area, hoepfully the problem is solved. If it should happen again, you can try and isolate the cat you suspect to be the culprit, but if you can't determine which one it is, you might have to check both their urine samples to find out if either has an infection. If both cats are medically fine and it is determined to be a behavioral thing, you might try adding another litter box somewhere in the house. It's possible that in between the times you clean the litter, one cat's "scent" may be offending the other. With 2 boxes, there's more of a chance of the cats finding a clean place to go. Let us know how things go.
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Dottie

Proudly owned by The Catnip Crew...Munchkin,Casey,Maddie,Harley,Meadow,Ashley,Nicky and Mushka

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• Urinating just outside the litterbox - Hawthorne, Tue Apr 29 12:56:20 2003
• RE: Urinating just outside the litterbox - karlacue, Tue Apr 29 13:15:40 2003
• RE: Urinating just outside the litterbox - MunchieScrunchie, Tue Apr 29 20:13:27 2003
• RE: Urinating just outside the litterbox - PHCurious, Fri May 2 14:35:32 2003
• RE: Urinating just outside the litterbox - Hawthorne, Fri May 2 15:45:41 2003
• RE: Urinating just outside the litterbox - MunchieScrunchie, Sun May 4 13:22:57 2003
• RE: Urinating just outside the litterbox - Hawthorne, Mon May 5 05:39:19 2003
• RE: Urinating just outside the litterbox - pmantone, Tue May 6 18:26:51 2003
• RE: Urinating just outside the litterbox - PHMadameAlto, Tue May 6 18:46:12 2003
• RE: Urinating just outside the litterbox - JassyKat, Fri May 9 20:29:51 2003
• RE: Urinating just outside the litterbox - Hawthorne, Sat May 10 10:00:56 2003
• RE: Urinating just outside the litterbox - JassyKat, Sat May 10 21:27:03 2003
• RE: Urinating just outside the litterbox - PHMadameAlto, Sun May 11 15:55:16 2003