Oh, deer!

Authorities in Colorado are advising residents to quickly leave the area if they encounter an aggressive elk in a Colorado park following three recent incidents where two children, a woman, and her dog were harmed by these enraged animals.

The stomping attacks sent the two young visitors at the recreational hot spot in the town of Estes Park to the hospital — and the woman needing medical treatment, Colorado Parks and Wildlife said in a release Friday.

“Cow elk with young calves are known to be aggressive, however we’ve never seen a year like this,” agency Wildlife Manager Jason Duetsch said in a statement. “All three attacks have been unprovoked and unfortunate accidents.

“We have no clear evidence to suggest these attacks were from the same animal, which underscores how uncommon the elk behavior has been,” he added.

Officials said the attacks likely involved elk moms protecting their nearby young.

In the latest attack Friday, the woman was walking her dog on a leash when she startled an elk cow from about 20 yards away — and it took off toward her and her frightened pup.

The woman tried to duck behind a tree, but the animal knocked her to the ground and kicked her several times, forcing her to seek medical attention, the parks agency said.

Last Monday, a 4-year-old boy was playing in the park playground near where two elk cows were hidden behind a rocky area — and one ended up charging the child and stomping on him before the animal was scared away by shocked relatives and bystanders, the Denver Gazette said.

On May 30, an 8-year-old girl was riding her bike when an elk charged at her from about 60 yards away, knocking the youngster over and sending her to the hospital, the outlet said.

All three victims suffered non-life-threatening injuries, officials said.

“The best way to prevent an elk attack is to keep your distance,” park officials said. “If an elk seems overly interested in you or is displaying aggressive behavior, leave the scene immediately.

“Being highly aware of your surroundings is also beneficial,” the statement said. “Elk can tend to go unnoticed when in rocky, shadowed or wooded areas.”

Meanwhile, a Colorado Springs man shot and killed a deer Friday night after the animal attacked several dogs and a pregnant woman in that town, CBS News said in a report.