Have your cats been litterbox trained to begin with? It doesn’t sound like it.

Four cats and one litterbox is too many cats for one litterbox. Add the stress of new cats to the mix and it is almost predictable.

Inappropriate elimination (urinating or defecating outside of the litter box, and/or spraying) is the most common behavior problem of older cats. There are numerous causes for this behavior, many of them medical, so a cat who has inappropriate elimination should be examined by a veterinarian. Laboratory tests will need to be performed in most cases.

Contributing factors to inappropriate elimination

Medical conditions: Medical conditions which result in an increased frequency of urination or defecation may be the underlying cause for this behavior problem. These conditions include: colitis, inflammatory bowel disease, diabetes mellitus, hyperthyroidism, kidney or liver disease, and feline lower urinary tract disease (FLUTD). Medical conditions which cause pain urinating or defecating, or make it difficult for the cat to get in and out of the litter box, may also result in inappropriate elimination. Such conditions include arthritis, FLUTD, anal sac disease, loss of vision, and some forms of colitis. Treatment of these medical conditions may help to resolve this behavioral problem. In addition, using litter boxes with lower sides, placing the litter box in the area in which the cat spends the most time, and increasing the number of litter boxes may be helpful.

Stress: Stress can be a major cause of inappropriate elimination in cats of all ages. Stressors such as moving, changes in routine, holidays, or changes in the makeup of the family can result in inappropriate elimination. Reducing these stressors or decreasing their impact on the household will benefit your cat (and probably you, too!). For instance, when moving, attempt to keep the cat in a quiet portion of the home when packing and during the actual moving day. At the new residence, confine your cat to a quiet room at first (probably a bedroom), placing her food, water, litter box and favorite sleeping material (bed, sweatshirt, etc.) in the room. Spend time with her in that room and feed her and clean the litter box at the usual time. Gradually let her become accustomed to the rest of the house.

Box location: Some cats may not like where a box is located. It may be located too close to their food or water. It may be in a high traffic area where they cannot have privacy. It may be in an area where they can be easily ambushed by another cat. It may be on a different level of the house than where they spend most of their time. In addition to trying various substrates, also place extra boxes around the house to see if box location makes a difference. There should always be at least one more litter box than the number of cats in the household.

Sanitary conditions: Some cats are very particular. Some will not defecate in the same box in which they urinate. Others will not go in a box which has been used by another cat. Just as we do not like to use dirty bathrooms, neither do many cats. If the litter box is not cleaned regularly, they may decide to find a different bathroom.

Possible Solutions to Inappropriate Elimination *

Have your cat checked by your veterinarian for a possible medical condition, and start treatment for the condition if one exists. If the cat is extremely stressed, talk to your veterinarian about some medications which may help.
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If you have multiple cats and do not know which one is the culprit, your veterinarian can give you some fluorescent dye to feed one of the cats. The urine from that cat will fluoresce when exposed to a black light.
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Place numerous litter boxes around the house. You do not have to use anything fancy: dishpans, large plastic containers, or other items may work just as well. Try a larger litter box, such as a sweater storage box; some behaviorists feel litter boxes are often too small.
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Clean any soiled areas with an enzyme cleaner designed for use on pet urine and stool. Regular detergents and other cleaners will not break down the urine or feces, and if the cat smells any urine or feces on a carpet or floor, the cat may continue to use that spot to eliminate. In some cases, the carpet or carpet padding may need to be replaced.
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Feed the cat where she is inappropriately eliminating. Many cats will not urinate or defecate in the area in which they are fed.
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Take your cat to the litter box frequently, and if she uses it, praise her, or even give her a treat.
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If you catch your cat in the act of urinating or defecating outside of the box (or even using the digging motion), use Martha M