It bothered me how that account just made up names for the dogs if they thought it'd get more likes. Pretty sure they renamed "ethnic-sounding" names to bland ones like "John" as well. It's quite possibly the least important thing on the planet but it still bothered me lol.
Language is always evolving, and for a term as long standing as pet, with such wide use, it's no longer an incorrect use of the word. Pet as a past participle aligns with the use of similar words like bet and set, and on a cultural basis petted sounds like the way a little kid speaks.