In a statement, Marineland confirmed that the scene was filmed on May 21, adding it was a simple case of a pebble being lodged in the animal's hoof - "similar to when a beachgoer has a pebble in their shoe. This is an experience that no one, not even a deer, would enjoy."
"The catastrophized medical diagnoses offered by individuals relying on poor quality footage shot on cell phone cameras is once again wrong," the park added.
A spokesperson for the park stressed to The Dodo that "all the animals are in good health and well taken care of."
But Philip Demers, who worked at Marineland for 12 years as a senior trainer, tells The Dodo he isn't convinced.
He says the video, which he posted, and which was sent to him by a source at the park, suggests "the deer's shoulder is inflamed."