Great Danes are a breed known almost as well for their gentleness as they are for their huge size.
However, several of the massive dogs at a Colorado breeding facility broke the mold this weekend when authorities say they attacked a group children and left them badly mauled.
It happened Saturday in El Paso County, where authorities say a woman was checking in on her boss's dogs.
According to the El Paso County Sheriff's Department, the woman's boss breeds the huge--and normally docile--dogs.
She took her five children along with her while paying the home a visit. While her attention was focused somewhere else, the unnamed woman heard terrified screams, reports the Denver Post.
The woman then discovered that three Great Danes, which can weigh as much as 200 pounds, had attacked four of her children.
While the extent of their injuries weren't released, three of the children were injured seriously enough to require immediate medical attention.
"It looks like three are going to have to undergo surgery," spokeswoman Jacqueline Kirby said.
Kirby said the children were bitten on the head and torso and possibly their extremities.
While attacks by Great Danes are rare, they aren't unheard of.
Last April, a 10-year-old girl was attacked to within inches of her life by a Great Dane in Illinois.
A year earlier, the Dog Whisperer himself, Cesar Milan, was out walking a group fo dogs that included a "troubled" Great Dane.
According to TMZ, a neighbor of the TV star's reached out to let the dog sniff his palm when the Great Dane latched on, biting the neighbors hand and forearm. The neighbor was treated at a hospital and released.