I just had the WORST BEST thought!
I haven't quite decided whether Harry will take Divination in Black Dog Mine, but can you IMAGINE Trelawney's reaction if they do tea leaves?
"The Grim, my dear, the Grim," cried Professor Trelawney, who looked shocked that he hadn't understood. "The giant, spectral dog that haunts churchyards! My dear boy, it is an omen—the worst omen—of death!"
"You mean Snuffles? Nah, he's alright. Just downstairs if you want to meet him."
Cue Trelawney storming into the staff room to demand to know what Severus is thinking, letting this continue, like the world's most ridiculous parent-teacher conference. And Snape being just utterly bewildered, like
"There is currently a werewolf standing right behind you, Sibyl. My dog should be the least of your concerns." His lip curled. "At least the mutt is house trained."