The pet should not just be a prop; treat the dog as a main supporting character with its own quirks, preferences, and "opinions" on the love interest.
If you're interested in creating your own story:
This is the painful one. You introduce your crush to your best friend for a "double date" setup. You spend three hours trying to impress her. Meanwhile, your dost sits quietly, looking empathetic. That night, you get a text: "Hey, your friend just DM'ed me. He's actually really sensitive."
These storylines often rely on specific tropes and themes to pull at the audience's heartstrings.