Changes

However, even though outdoor access is fraught with problems due to a lack of owner understanding of the actual needs of cats, there is evidence that a lack of outdoor access contributes to problem behaviour. Heidenberger (1997)<ref>Heidenberger, E. (1997) Housing conditions and behavioural problems of indoor cats as assessed by their owners. ''Applied Animal Behaviour Science''. 52, 345-364.</ref> found that cats that were allowed to go outside when they wanted, or at least 2-3 times weekly, were less problematical to their owners.

However, even though outdoor access is fraught with problems due to a lack of owner understanding of the actual needs of cats, there is evidence that a lack of outdoor access contributes to problem behaviour. Heidenberger (1997)<ref>Heidenberger, E. (1997) Housing conditions and behavioural problems of indoor cats as assessed by their owners. ''Applied Animal Behaviour Science''. 52, 345-364.</ref> found that cats that were allowed to go outside when they wanted, or at least 2-3 times weekly, were less problematical to their owners.

==References==

==References==