A student is writing an argumentative essay about adopting shelter animals instead of buying pets. Which detail would not be relevant to the argument? Cats are more popular pets than dogs. Many dogs and cats need homes. Adopting shelter pets helps save lives. Animals from pet stores are often unhealthy.

Cats are more popular pets than dogs.

The detail that would not be relevant to the argument is: "Cats are more popular pets than dogs." While it may be a relevant fact in other contexts, it does not directly support the argument for adopting shelter animals instead of buying pets.

The detail that would not be relevant to the argument is "Cats are more popular pets than dogs."