A blind woman has described how staff at a Tesco supermarket in north London shouted at her to leave because she was with her guide dog.
Maya Makri, 39, said she was in a branch in Swiss Cottage when three cashiers told her pets were not allowed in the store and told her to leave.
Her guide dog Jemma was wearing a high-visibility jacket and a harness labelled "guide dog" when the incident happened on Monday.
She told the BBC, "I got to the till and could sense there was an uncomfortable atmosphere then the man behind the till started shouting 'no pets allowed'. I said 'it's a guide dog and I'm registered blind', but his two other cashiers joined in the shouting match.
"Everyone in the queue kept saying 'she's allowed to have a dog' but the cashiers were just completely adamant that dogs were not allowed in the store."
Ms Makri, who moved to London from Leeds to study, said the exchange was "very upsetting" and left her feeling "outraged".
But she later tweeted that she didn't blame the staff at the store, but a lack of training from Tesco.
Tesco has since stressed guide dogs are allowed in its stores.
A spokesman said: "This clearly should never have happened and we will contact Ms Makri directly to apologise. We do allow guide dogs in stores and have reminded colleagues of that. We also offer customers with guide dogs help with their shopping, if they would like assistance."