Balloons Over Bend, the annual hot air event taking place this weekend, is not always fun for animals.

The unknown sight of a low-flying balloon, the passing shadow and roar of propane burners may frighten pets. Even horses are known to become agitated by overflying balloons.

The Humane Society of Central Oregon reminds animal owners to keep pets indoors and wearing identification.

Don’t bring your pet to the event. Balloon landings are unpredictable, so pets in surrounding areas should be kept in a safe place, the society stated Thursday.

The balloons are scheduled to take off from Riverbend Park around 6 a.m. today, Saturday and Sunday. Nightglow begins around 8:30 tonight at the park.

“Every year the Bend animal shelter receives animals and reports of lost animals that have been frightened by the balloons,” according to the Humane Society.

Lost pets should be reported at 541-382-3537. Animals that arrive at the Bend shelter are posted at www.hsco.org.