Veronika Uhrova had only just walked inside the Londis convenience store for a few minutes when she discovered her dog, Bentley, a five-year-old Yorkshire terrier, had been taken.
The dog was stolen from the shop front on Middleton Road in the Grimsbury community of town around 5pm on Tuesday May 5.
Veronika said: "I only went inside for a few minutes and then he was gone. He's got my number on his collar, but nobody has called yet."
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She reported the theft to Thames Valley Police and to the Dog Lost group, the UK's largest lost and found dog service.
A witness saw Bentley being taken away by a man around 25 years old with bleached blonde long hair with a 'Mohican style' ponytail.
Bentley is also microchipped with a stolen alert on the record.
An active investigation by Thames Valley Police remains ongoing.
Anyone with information about the theft of Bentley can call police on 101 quoting crime reference number 43200133560.
Veronika has found it difficult to believe anyone would want to steal her dog. She has put up posters around the neighbourhood hoping someone will see him.
She said: "He's such a friendly little dog. He's just a tiny 2.5kilo Yorkshire Terrier. He's my little baby.
"He's not just a dog, he's part of the family."
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