The horses were scared and galloped violently while guests laughed in the background before one of the animals fell to the ground

Video footage of the event shows two canisters lit over the saddle of each horse before a cloud of pink smoke shot out

Brazilian authorities are seeking to interview a couple that used horses as props for a gender reveal

Parents tend to find creative ways to reveal the gender of the children they're expecting to welcome to the world.

A couple in the southwestern Brazilian city of Santa Helena de Goais has gotten itself into hot water with the law after they used two horses for a prop a week ago.

Video filmed by one of the guests showed two men holding each of the horses by their saddles moments before the event went awry in a home's backyard.

A cannon containing the special gender reveal powder had already been lit with a flare and one of the men was lighting the cannon on top of his horse's saddle.

Brazilian police have opened an investigation following the filming of two horses that were used as props during a gender reveal party in the southwestern Brazilian city of Santa Helena de Goais

A man attempts to regain control of a horse that galloped violently after a gender reveal canister prop was lit with a flare at a home in Brazil

A cloud of pink smoke subsequently shot out of both canisters, revealing the parents were going to have a girl and sending the horses into a frenzy.

The horses could be seen jumping violently as the powder hovered in the air while a man laughed and tossed confetti into the air.

One of the frightened horses crashed to the ground before both animals were brought under control as the filming was cut short.

Santa Helena de Goais Civil Police opened an investigation although the names of the couple have not been released.

A horse is covered by pink smoke during a gender reveal party in Brazil last week

Goais state deputy Eduardo Prado, who also oversees state assembly's animal rights commission, released a statement indicating that the horses 'were placed in a situation of embarrassment and extreme stress.'

'Idiocy knows no bounds,' he said on his social media networks. 'Cases of mistreatment happen in different ways and in this video we can see how creative Brazilians are, but not necessarily for good, right?'

He also casted shame on people who took to social media to make light of the situation and mocked the horses.

'The animals are clearly uncomfortable, afraid and reacting to protect themselves. And there are those who think they are the wrong ones in this story. Prado said.

'We will not allow this to go unnoticed. We disapproved of this practices and wants exemplary punishments for those who mistreat animals. Idiots like these need to serve as an example to show that you can't do what you want with animals.'