Cclassification of 1 vs infinite set
I will suggest you use pre trained deep learning models like vgg16, resnet50 which are available in Keras frame work. Train the model on images having only 2 category , i.e with dog and with out dogs. Than run the model on the existing dataset you will definately get your result.
How to filter a specific type of image from the rest of the type of image.
Consider i have a data set consisting of images of dogs only. I need the classifier to differentiate between dogs and all the other types of images in the world that are not dogs.