Bella, a yellow Labrador, melted the hearts of many when a photo emerged of her with her owner on Reddit, an aggregating social media site.
The pup is specially trained to help Valerie Parrott of Sioux Falls, South Dakota, cope with anxiety.
On Parrott's wedding last weekend, her loyal pup was right by her side to help calm her down.
Parrott also suffers from frequent migraines that affect her daily life. Two years ago, she was matched with Bella, who stays vigilantly by her side.
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"We've been inseparable ever since," she said.
Parrott writes about her experiences to help others understand more about panic disorders and service animals.
"Ever since I was paired with Bella and entered the world of service dogs, I have wanted to make a positive impact on our community," she told CNN.
"Bella's medical alert title refers to her ability to predict and inform me of different type of body changes," Parrott writes on her blog.
Bella alerts Parrott of an upcoming panic attack by nudging her nose or licking her hand.
"Usually, her warning is all I need to get to a safe place or to take action to prevent a panic attack."
Weddings can cause enough stress on anyone, let only someone who suffers from anxiety.
"A lot of girls experience their first panic attack leading up to weddings," she blogged. "A lot of girls with these disorders double their number of normal panic attacks."
"She was definitely there to work," she said.
Dressed in a pink tutu, the pooch even had her own moment down the aisle, as she was the flower girl.
The photo has helped bring attention to service dogs and the role they play in their owners' lives.