The most common behavioural problems in cats are inappropriate elimination, furniture scratching, destruction of plants, aggression, and over-grooming and fur pulling. For information on what causes these problems and how to solve them, see the following articles.
Inappropriate Elimination
One of the more difficult problems to deal with is cats urinating or defecating in places other than their litter boxes. For causes of and cures for inappropriate elimination, see:
Scratching is a natural behaviour, and owners should not expect to eliminate it. However, they can train their cats to use scratch posts and avoid forbidden surfaces: