What's with Teddy's ears standing on end?

Teddy dog's ears stand up because of genetic factors and the characteristics of ear cartilage. In Teddy dog breeds, there is a vertical ear gene called vertical ear gene. This gene causes Teddy dogs' ears to stand up naturally as they grow up.

The process of ear standing up is mainly due to the change of cartilage development in the ear bone. When Teddy was a puppy, his ears drooped because his cartilage was not fully developed. With growth, cartilage will gradually harden and ears will slowly stand up.

It is worth noting that not all Teddy dogs' ears can stand up naturally. Some Teddy dogs have non-ear-standing genes, so their ears may always droop or only one ear will stand up.