Spraying is when your cat leaves small amounts of urine in the house.
This is usually done on vertical surfaces such as a doorframe, wall or even furniture.
Spraying is not really a house training problem, it is more of your cat announcing his presence.
There can be a number of reasons why your cat suddenly starts spraying.

• Your cat is marking out his territory and the spraying is to let other cats know of his presence.
  
• A medical problem such as a urinary tract infection.
  There can be other medical reasons so it is a good idea to check this with your vet.
  
• If your cat is an intact male, he could spray to let females know of his sexual availability.
  
• The spraying could be a direct result of stress or anxiety.
  
• f you have recently moved house, your cat could be marking out his new area.
  
• It could be that your cat feels insecure because a new animal or person (such as a baby) is in the house.
  
• Conversely, your cat may start to spray if someone leaves the house either permanently or during the day if they start a new job.
  
• If you have renovated your house, painted it or perhaps rearranged the furniture, your cat may want to remark his territory.
  Painting in particular will remove his smell.
  
• It could be that your cat feels it is not getting as much attention as he'd like.
  
• In rare situations, cats may try to mark a person as their own.
  

Not all cats will spray, however some are more likely to do this than others.
Unneutered or intact male cats will spray more than neutered males.
Intact females will spray more than spayed females.
Unless you plan to breed your cat (male or female), have it in neutered.
It's not guaranteed to work as approximately 10% of neutered males and 5% of neutered females still spray.
However, statistics are showing that approximately 87% of cats stopped urine marking once they had been neutered.
And of this number, around 78% stopped spraying immediately and 9% stopped after three months.
Not only will having your cat neutered or spayed reduce the likelihood of spraying, it will also eliminate the chance of wanted kittens.
If your cat does start spraying urine, you first need to find out the reason that this is happening.
It is the same with children.
You can't expect to change behaviour if you don't know the reason for it.
Start watching your cat to find out what it does.
Learn his body language.
When you see your cat about to spray urine, distract it in some way.
This could be something as simple as clapping your hands, rattling a tin with some stones or marbles in it or spraying water from a water pistol or spray bottle.
It may take a little while to retrain your cat, but this is probably the easiest and most effective method of doing it.
Unfortunately, cat urine spraying or marking inappropriately is a major reason that cats are taken to shelters or abandoned.
By spending some time finding out why your cat is spraying and working to change the behaviour, you will once again remember and enjoy the reasons you adopted your cat in the first place.