The youngster was mauled while the dog’s owners allegedly laughed in Burslem Park in Stoke-on-Trent, Staffordshire. The boy suffered a cut to his arm in the horror and was taken to hospital.
Sharing details online, the mum wrote: “Hi all, I wanted to share with you what happened to me and my four-year-old son on the 29th August 2021 around 17.30.
“Whilst we were playing tennis a dog came running up to my son and jumped on him; and started attacking him.
“I ran to save my son and was pushing the dog off. The owners were laughing and reassured me that the dog was only playing.”
Stoke-on-Trent Live reports the dog was a French Mastiff and says its owners only intervened when the boy’s mum started screaming and shouting.
The mum added: “My son since then has been crying all day and night.
“He is very traumatised by this. No child should ever go through what happened to my son. He is very lucky as he was not severely injured and the wounds were not that deep.
“They still believed that the dog was playing and he was not a threat at all.
“I started shouting and screaming which then the owners got involved.
“As soon as the dog was off my son, I could see how scared and traumatised my son was. He had a wound to his inner arm and his top was ripped from the shoulder part where he had another wound.”
Staffordshire Police are investigating the attack, which happened on August 29.
A spokesman for the force said: “We are currently investigating an incident where a three-year-old boy was bitten by a dog at Burslem Park.
“The owners of the dog have been described as white.
“The man was wearing a red jacket, a baseball cap and shorts and the woman was wearing a grey Adidas hoodie.
“The boy was taken to A&E with cuts.”