If you reeeeeeeeeally want to emphasize something in writing, you can engage in what linguists call expressive lengthening, or making a word longer by repeating letters. It’s an example of paralinguistic restitution — rendering in text cues such as...
If you have two dogs that share a toy, do you write that as my dogs’ toy or my dogs’s toy? It’s one of those things to which we can come up with a logical answer, but then later we’ll catch ourselves doing a different illogical thing. Possessive...

