Keith Gill, a key player in the 2020 and 2021 meme-stock craze known as "Roaring Kitty," posted an image of a dog on X Thursday. Shares of Chewy and Petco briefly spiked higher Thursday after the post and were halted due to high volume. The stock swings come after Gill posted on social media in May for the first since 2021, sparking volatility in shares of GameStop and other meme stocks. GameStop, for its part, saw a share price spike of more than 10% Thursday to $26.69 before closing nearly 4% higher at $2 ...