You use an Anti-natalist argument.

You know one thing that Sarah really cares about and that’s the environment, maybe an anti-natalist argument will swing her.

“You know this planet is already way overpopulated, right? Wouldn’t it be better to get a new hamster that’s already been born than burden our taxed planet with another creature? Think of climate change and the carbon footprint of one hamster!”

“Oh yeah, I forgot about all the waste and energy Dini uses up eating hamburgers all day and driving around in some big boxy SUV,” she mocked. “If you’re so concerned about Dini’s effect on the environment, I’ll hook his hamster wheel up to a batter to recharge our phones, sounds pretty net zero, doesn’t it?”

You should have realized how silly that argument was.

Use the ship of Theseus argument, a Dini copy wouldn’t be the same hamster when you think about it.

You’re messing with the natural order of the world; this could have huge butterfly effect consequences

According to the tenants of Darwinism, Dini being murdered by the cat means we should let him die and not re-enter the gene pool.

Oh, give up, lets help her bring him back