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In Japan the number of owners abandoning their pets is so high the authorities are having to devise new ways of 'disposing' of them.

Instead of being looked after in animal protection centres the majority of unwanted pets are destroyed.

One municipal authority in Japan has developed a mobile gas chamber to put down abandoned dogs while they are transported to a crematorium.

It is a policy which some Japanese animal lovers find hard to understand.

Roland Buerk reports from Tokyo.