Cat-themed cryptocurrencies surged Thursday after controversial trader “Roaring Kitty” returned to social media with an intriguing post. What Happened: Keith Gill, better known online as “Roaring Kitty,” posted a photo of a cartoonish dog, marking his first post since June 18. The photo shows a dog looking sideways, sticking its tongue out, without any captions. As has been the case over the last month-and-a-half, cryptocurrencies with “Kitty” in their names began to surge. Within minutes of the post, Solana (CRYPTO: SOL)-based Kitty AI spiked 34% to its weekly highs. While profit-taking halte…