When do Chihuahuas’ ears stand up?

Chihuahuas’ ears begin to stand up between three and six months of age, but this can vary from dog to dog. It's common for their ears to be floppy when they’re young, especially in their early weeks of life. The cartilage in their ears needs time to develop and strengthen, which is what allows them to stand up. If a Chihuahua’s ears don’t stand up by the time they’re about six months old, they may stay floppy, though many dogs with floppy ears are still perfectly healthy and have no issues. Genetics also play a role: Some Chihuahuas naturally have more upright ears, while others may have ears that stay down.