hippomania

1) horses (A passion or obsession with horses[1] as well as a madness in horses[2]) => [hippo-] (Greek) meaning 'horse' [see hippophobia (opposite)] 2) hippopotamuses (passion or obsession with hippopotamuses [3] => [hippo-] (Greek) meaning 'horse' & [ potamos ] (Greek) meaning 'river'.
Found on http://en.wikipedia.org/wiki/Glossary_of_manias

hippomania

hippomania An obsessive fascination for or an excessive enthusiasm for horses.
Found on http://www.wordinfo.info/words/index/info/view_unit/2735/9

hippomania

obsession with horses
Found on http://phrontistery.info/h.html
No exact match found