The meme is in reference to a twitch streamer (Hasan) who pushed something on a live stream and the dog flinched. People thought it was a shock collar but he later clarified that it was actually a collar made for training and he said it was set to vibration mode.
In the image it's Eustace from Courage the Cowardly Dog shocking Courage. Eustace hated the dog and regularly abused him.