Changes

* '''Illness''': Conditions that alter the cat’s emotional state or interaction with other cats ([[Hyperthyroidism|hyperthyroidism]], senility, pain, hyperaesthesia, debilitation) or need for resources (conditions causing polydipsia or polyphagia).

* '''Illness''': Conditions that alter the cat’s emotional state or interaction with other cats ([[Hyperthyroidism|hyperthyroidism]], senility, pain, hyperaesthesia, debilitation) or need for resources (conditions causing polydipsia or polyphagia).

* '''Excessive population density outside the home''': In areas where there is already a high population density of cats this can restrict resident cat's ability to use outdoor resources, and brings non-resident cats close to the home. Resident cats will use spray marking in an attempt to maintain distance from other cats that they see around their territory.

* '''Excessive population density outside the home''': In areas where there is already a high population density of cats this can restrict resident cat's ability to use outdoor resources, and brings non-resident cats close to the home. Resident cats will use spray marking in an attempt to maintain distance from other cats that they see around their territory.

* '''Unfamiliar odours brought into the house''': Non-resident cats may spray close to a front or garage door so that this odour can come into the house; owner’s shoes, clothing or bags may pick up odours from outside.

* '''Unfamiliar odours brought into the house''': Non-resident cats may spray close to a front or garage door so that this odour can come into the house; owner’s shoes, clothing or bags may pick up odours from outside.