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At Jacobs Island Dog Park on Wednesday afternoon, Laura Tonnessen threw a stick into the river for her dog Thor. He barked enthusiastically, retrieving and dropping the stick at her feet. But in a few days, on the Fourth of July, Tonnessen knows Thors demeanor will change. The loud fireworks frighten him.

Hell hide behind furniture and act weird and whine, Tonnessen said.

Last year, Tonnessens friends pitbull, Cracker, ran away and was lost for three days because he was spooked by loud fireworks. It was traumatic to lose him for so long, Tonnessen said, and she makes sure to keep Thor inside on the holiday to prevent him from running away, too.

Michael Edwards, a student at the University of Montana, said his 130-pound great Pyrenees, Snowy, climbs into the bathtub, pulls the shower curtain closed with her mouth, and howls until the thunder storm or fireworks end.

If shes outside, she runs. They once found her about seven miles from their house, trying to escape the source of the noise. Animal shelters report that July 4-5 are their busiest days of the year.

When dogs bark, flee or cower on the Fourth of July, they are exhibiting symptoms of a panic disorder called noise phobia.

Fireworks and other loud noises terrify a fraction of all dogs, and their reactions sometimes endanger their health. Dogs may jump through windows, climb fences or run away for days to try to escape the sounds of patriotic celebration.

This phobia, which is a symptom of underlying anxiety issues, has recently been linked to a certain gene in dogs, says Dr. Leticia Fanucchi, a veterinary behaviorist at Washington State University's College of Veterinary Medicine.

Some dogs are more genetically predisposed to anxiety disorders, Fanucchi said, just like humans.

The area that is activated in our brain for fear is the amygdala, and the amygdala can be triggered long before the prefrontal cortex can process information, Fanucchi said.

Its like people who suffer from arachnophobia even if you explain that the spider won't hurt them, it activates the amygdala and makes them panic.

The amygdala is where irrational fears trigger a fight, flight or freeze response, while the prefrontal cortex controls reason and rational decision-making. Dogs panic at the sound of fireworks because they think their lives are at risk, even if they are safe at home.

Fanucchi said not all breeds of dogs carry this anxiety gene, and some are more prone to it than others. Within one breed, a dog could have the anxiety gene while another might not. This explains why some dogs dont react at all to loud noises. Those that do are typically anxious about other things, as well.

What we do know is that a good chunk of the dogs that have noise phobia do have generalized anxiety as an underlying disease, Fanucchi said. About 40 percent of the dogs that have generalized anxiety have noise phobia. So noise phobia is a big red flag that something else is going on with that dog, and it needs to be diagnosed and treated appropriately.

For this Fourth of July, its too late to start a long-term medication regimen to treat anxiety because medications typically take a few weeks to become effective, Fanucchi said. But there are other, short-term practices that can minimize dogs anxiety and keep them safe.

Creating a quiet and distracting setting for dogs can help them stay calm, said Emily Adamson, director of Organizational Advancement at the Humane Society of Western Montana. Scent therapy, like lavender spray, is popular for calming dogs, Adamson said.

Food toys and soft music (they play classical at the shelter) help distract the dogs from the source of their fear. For people who do take their dogs outside, Adamson recommends double-checking their ID tags to make sure the information is current, in case the dogs run away.

And then, theres the Thundershirt.

Dr. Lindsey Rewinkel at Pruyn Veterinary Hospital in Missoula said Thundershirts are available at pet stores and some veterinary hospitals, and serve as a dog anxiety vest.

Its a heavy fabric fashioned into a shirt that you wrap them in, Rewinkel said. Its not quite as severe as a swaddle, but the goal is to make them feel comforted. That has helped an incredible amount of dogs cope with noise phobias if they're not as severe.

Finally, there are medications vets can prescribe that sedate dogs and minimize their anxiety symptoms on the Fourth of July if none of these other practices work. Rewinkel said she always urges people to also treat the underlying anxiety issue with long-term behavioral therapy, and not just resort to medication, which can serve as a Band-Aid solution to a larger problem.

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Why does your dog hate Fourth of July fireworks? It's genetic - The Missoulian

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