That is usually a behavioral issue when it comes to deficating in other areas. I thought when you stated going to the bathroom you were meaning urinating I am sorry. But with the other signs you are seeing in your cat, I agree it definatly warrents a trip to your veterinarian. It can be due to liter box dislike or it could be a territorial issue. When cats start marking as a territorial issue they leave a scent and you need to use an odor neutralizer to rid that area of the scent. I am not sure how long you have had both cats, if you have had both of them for awhile then it could be health related, not behavioral. Some cats like their own box and refuse to use one another cat has used. I have two cats and they each refuse to use the other ones litter box. More work for me but that is their nature, what can you do. It could be that your other cat has an infection, allergy. or internal parasite if she is scratching herself raw and you have used a good product like Revolution and have not seen any fleas. I have included some more information below I feel will be of help to you.
If your cat spends a large portion of his time scratching, he may have a condition known as pruritus, or itching, an unpleasant sensation that causes your cat to scratch or bite at himself. It is caused by chemical reactions that occur in the skin and stimulate the nerves, causing the brain to feel the itch. In fact, the act of scratching itself may stimulate these inflammatory reactions in the skin and make the condition worse. Any skin condition that causes inflammation can cause pruritus.
How pruritis affects your cat’s health depends on the degree of the pruritus. Mild pruritus may hardly have any effect at all. However, severe pruritis leads to intense scratching, which may result in painful skin lesions that may become infected.
Every cat has a threshold of pruritis or an “itch threshold.” This is the point where all of the sources of itching finally add up to enough irritation to cause the irresistible urge to scratch. Scratching begins when the stimulation exceeds that threshold. For example, a cat with a mild allergy to house dust mites may be below the threshold but may begin to scratch severely when he becomes infested with fleas.
Pruritus is associated with other skin diseases, including secondary bacterial skin infections (pyoderma) and secondary yeast infections. But it is the main symptom of skin conditions like allergies and skin parasites.
http://petplace.netscape.com/Articles/artShow.asp?artID=2861&q=scratching
Some cats may develop a preference for a certain type of litter, with regard to texture and odor. Some dislike scoopable litters and others dislike coarse clay litter. Some will not tolerate chlorophyll-based litter or perfumed litters because of the strong odor. If the problem regarding urination or defecation outside the litter box develops after changing the type or brand of litter, returning to the original brand should resolve the problem.
Cats are fastidious creatures. For some cats, a litter box that is not frequently cleaned will be unacceptable, and daily or more frequent cleaning may be required. Some cats want their own litter box and some will not urinate and defecate in the same box. Having multiple litter boxes for a multi-cat household is important. The correct formula is N+1 (where N = the number of boxes required in a multicat household.
For all housesoiling problems, a variety of environmental changes may be helpful. If environmental changes are not effective, you might have to isolate the cat in a room with a litter box in order to re-train it. Treats or playtime with the family are rewards that can be used for successful use of the litter box. Once your cat is using the litter box properly with no mistakes, then he/she can be allowed back into the general family areas.
http://petplace.netscape.com/Articles/artShow.asp?artID=633&q=defecating+outside+litter+box
Edited by calliecat on October 7 2005 at 3:31am__________________
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