This cartoon by Dave Brown from The Independent is based on a painting by Sir Edwin Landseer. The Dogs of St Bernard, painted in 1860, shows two of the celebrated dogs rescuing a lost traveller, while the monks are rushing from the hospice to help the person lying in the snow. In Dave Brown's version, the dog is Angela Merkel (wrapped in an EU flag), and the traveller David Cameron. However, rather than reviving the traveller with brandy, the dog urinates on him.
When Angela Merkel visited London on Friday, Cameron was hoping that she would support his ideas for EU reform (see here for more on this). However, in a speech to Parliament, she dashed his hopes by saying that those who expected her speech to pave the way for fundamental reform of the European architecture were "in for a disappointment". The caption 'To The Rescue' is ironic, since Merkel's speech did little to help Cameron out of his predicament over the promised in/out EU referendum.
The St. Bernard is a breed of very large working dog from the Italian and Swiss Alps, originally bred for rescue. The breed has become famous through tales of alpine rescues, as well as for its enormous size. St. Bernards are often portrayed wearing small barrels of brandy around their necks. Avalanche victims supposedly drank the brandy to stay warm while awaiting rescue, although this is medically unsound. The monks of the St. Bernard Hospice deny that any St. Bernard has ever carried casks or small barrels around their necks; they attribute the image to an 1820 painting by Edwin Landseer. (source: Wikipedia)