Brachycephalic animals are dogs and cats with a short, snub nose and a disproportionately broad head.
The breeds are as follows:

• Dogs: Affenpinscher, Boston Terrier, Boxer (all breeds), Brussels Griffon, Bull Mastiff, Bulldog (all breeds), Cane Corsican, Carlino (all breeds), Cavalier Spaniel, Chihuahua, Chow-Chow, Dogue de Bordeaux, English Dwarf Spaniel, Japanese Chin, Japanese Spaniel, King Charles Spaniel, Lhasa Apso, Maltese, Mastiff, Pekingese, Miniature Pinscher, Pitbull, Presa Canario, Saint Bernard, Shar Pei, Shih Tzu, Tibetan Spaniel, Yorkshire Terrier.

• Cats: Burmese, Exotic Shorthair, Himalayan, Persian.

Iberia does not transport these pets in the hold because they are more susceptible to heat stroke and breathing problems when exposed to stress or high temperatures. However, you can take your pet on board it meets the conditions for transport in the cabin.
You can also contact Woof Airlines to find out how to transport it as cargo.