The Rainbow Bridge is the theme of a work of poetic prose written some time between 1980 and 1992, whose original creator is unknown. The theme is of an other-worldly place to which a pet goes upon its death, eventually to be reunited with its owner. It has gained popularity amongst animal lovers who have lost a pet. The belief has similarities to the Bifröst bridge of Norse mythology.(Wikipedia)
"The Rainbow Bridge"
"Tokyo Rainbow Bridge"
"Rainbow Bridge (reinboburitsuzi)"