A COCKER spaniel was last night travelling 4,000 miles across the Atlantic to donate stem cells to her sick six-year-old pup.
Coco and her owner Robert Alcock, 52, set off for California yesterday from their home in Darwen, Lancs.
The op will be carried out on Sunday at the only US animal hospital to offer it.
The procedure is not available in the UK.
On Monday Coco’s pup Millie — who moved from the UK to San Francisco with owners Serena and Andrew Lodge — will have the cells from her mum’s bone marrow transplanted into her.
The Lodges have been told it is her only hope after she was diagnosed with cancer.
They will pay NC State Veterinary Hospital for the treatment plus Robert’s costs.
He has already sent a blood sample from seven-year-old Coco to ensure she is a match.
She should make a full recovery while Millie’s chances are less clear.
Catering manager Robert said: “This is a pioneering procedure, so we’ll have to wait and see.”