Flem.io : https://goo.gl/4Y4PHh
API powered by : https://dog.ceo/dog-api/
APIs used:
/api/breeds/list - Get the list of all dog breeds
/api/breed/{breed name}/images/random - to get the dog breed image
Dog CEO's Dog API. Over 20,000 images of dogs programmaticaly accessible by over 120 breeds. Image supplied by the Stanford Dogs Dataset. (274 kB)