The animal considered to be monogamous is the parrot.
Here is why:
Parrots: Many parrot species form strong pair bonds that can last for life. They mate for life and often share parenting duties.
Dogs: While dogs can form strong bonds with their owners, they are not considered monogamous in the biological sense.
Cats: Cats are generally solitary animals and do not form long-term pair bonds.
Horses: Horses are not typically monogamous, although they can form strong social bonds within a herd.
It is important to remember that animal behavior is complex, and there are always exceptions to the rule. However, parrots are generally considered to be the most monogamous of the animals listed.