Hana Korinkova claimed the rodent dropped out of the loaf as she cut into it and slid onto the side of the table.
She has now complained to health and safety inspectors, who are investigating the bakery where Hana purchased the loaf from.
Food inspector Martina Smidtova said: "When we inspected it we found the bakery broke a whole range of health and safety regulations.
"There was nothing to stop rodents from getting freely into stores of flour and dough."
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