If a dog has hearing loss in just one ear while being able to hear completely in the other ear the type of deafness is known as being unilaterally whereas hearing loss in both ears, often complete hearing loss is bilaterally. (petfoodtalk.com)
We looked for SNPs associated with breeds fixed for floppy or erect ears, and found a single region on CFA10 that is likely responsible for the difference in ear type (Figure 3B). (journals.plos.org)
Believe it or not, Pugs have two different ear type shapes. (wtfrenchie.com)