Assuming there is no medical problem then they are many reasons which can explain such behaviour.
Some common reasons might be;
- The litter box is too dirty or it has a cover and keeps the smell in.
- The litter box is in a non private area .
- The cat is part of a multi-cat household and requires its own litter box.
- Another common reason is the behavioral tendency to mark territory with urine. This is especially true of cats that have not
been spayed or neutered.
The key to getting rid of the smell of cat urine is to completely get rid of the smell, from the cat's perspective. Cats can smell much better than any humans .
Even, in cases when we think that we have cleaned and removed the smell completely, the cat is more likely that she/he can still smell where he/she urinated.
This is of course creates the problem since cats like to urinate where they have urinated before.
To get rid of the smell and clean the area thoroughly don't just use any household product. There are many products available from petshops that can get rid of the
smell completely. The best products contain enzymes and they will neutralize the smell.
Getting the urine and smell off the floor is easy but off the carpet it can be tricky. Try not to scrub the carpet as you will push the urine deeper into the carpet fibres.
Instead blot it gently, and follow the directions on the bottle.
NEVER use ammonia or ammonia based products to clean up cat urine since ammonia smells similar to cat urine, so you
will be making things worse. Another simply and cheap solution that it can be used is to mix equal parts of vinegar and water if you can't find any appropriate product for cleaning the mess