Newly-trained Max and his handler PC Pete Lloyd tracked down the woman and her one-year-old baby, who were at "significant risk of harm".
The two pups - nicknamed BB8 and Luke Skywalker - were found underweight and injured on beaches in Abereiddy, Pembrokeshire, and Trevone, Cornwall.
RSCPA Cymru has shared a number of 'unforgettable incidents' involving animal rescue from the past year.