Ryan Gosling saved a lost dog during a trip to celebrate his partner Eva Mendes' 42nd birthday.

Eva Mendes and Ryan Gosling

Eva Mendes and Ryan Gosling

The couple had collected a takeaway meal from Rick's Desert Grill in California with their 16-month-old little girl Esmeralda in tow, when their family car almost collided with the pooch which had wandered into the middle of a busy highway.

Rather than swerve to avoid hitting the cowering canine and continuing on their journey, the 35-year-old actor realised the stranded animal desperately needed their help and decided to pull over.

Ryan jumped out of his car and rescued the terrified mutt who had narrowly missed being killed by other drivers.

The actor planned to whisk Eva and Esmeralda away to Palm Springs for four nights and the family stayed in the opulent former estate of the late 'I Did It My Way' singer Frank Sinatra.

A source told ET Canada that Ryan wanted to make his girlfriend of five years' birthday extra special by booking the decadent pad which features four bedrooms, seven bathrooms, a recording studio, pool house and Sinatra memorabilia throughout and costs $2,600 a night to rent.