Our breeder we got Senorita from said that some of her dogs had problems (especially her dad) with ear infections, the Presas ears are long and floppy and her dad had his kept long, and her mothers were cropped, her dad had ear infections, her mother did not, so she wanted them cropped and it was in the contract. so we went with it.
Our CocKER Spaniel when i was growing up of course had the long floppy ears and he had constant ear infections .