Only vertical scratch marks are considered to be a sign of stress. But your cat can also scratch on vertical surfaces to keep its claws in trim. How can you differentiate the two types of vertical scratching?
Feline urine spraying is one of the primary methods used by cats to mark out their territory. Whether male or female, neutered or not, it is exhibited in some way by almost every cat...
In very stressful situations, some cats can react aggressively towards people, other cats or other household pets.
These signs are more often reported as a 'problem' for you, the owner, than as signs of stress for your cat(s). There are 3 types of obvious signs which you should be able to easily identify: