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Gideon the dog has been with the Glatfelter family for over six years

One day, they noticed his breath smelled particularly bad

When they got him tested, they learned he had a tumor in his mouth that was cancerous

Bad breath can often be a sign of something more serious.

In September 2025, Hayley Glatfelter and her family had just come home from the ICU, where their 1-year-old had been staying, when they first noticed something was off with their 6-year-old dog, Gideon, who they'd had since he was 7 weeks old.

“ We noticed Gideon’s breath smelled really bad. It smelled like something was rotting in his mouth," Glatfelter, 28, tells PEOPLE exclusively. "We assumed it was food stuck in his teeth, but when we went to clean his mouth, we saw the tumor."

"We had a sinking

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