(Thomas Suchanek / U.V.M.V via SWNS)By Stephen BeechDogs can be "destabilized" by hearing angry human voices, reveals new research. The study showed that dogs experienced both stabilization and destabilization of their balance when hearing angry or happy human voices. But angry voices were linked to the biggest destabilising effects, according to the findings published in the journal PLOS One. She says happy voices were linked with destabilization for 57% of the dogs and, surprisingly, stabilization - or “freezing” - for 43%. Dr Affenzeller said: "These findings suggest angry and happy human voices may elicit emotional arousal that can both stabilise and destabilise balance."