Dog owners have been left gobsmacked after learning why their pets twitch their leg when you scratch them in 'the spot' - but ...

KTVU previously reported Lopes was asked, "You yelling at my mama over there ... Officials said Williams told the younger Amar to kick Lopes' dog, which she did. The force of the kick sent ...

"Why does a dog kick their leg when you scratch their 'special' spot?" They added: "I was petting my dog just now and was thinking about it, since wherever I pet him he seems to kick his leg ...