Animal costume ideas are as varied as the species they aim to emulate. Consider dressing up like mama and baby combos, such as a cat and kitten or a dog and puppy. You could also opt for a zoo animal theme, with you in a zebra costume and your kid as a lion, panda or other relevant option.
If you have multiple children, simply put on a pair of overalls and a straw hat to fill the role of farmer, and outfit your kids as barnyard animals, such as cows, chickens or pigs. Beware of letting your little ones wear feather-adorned costumes inside the house, though, unless you want to spend the next few weeks vacuuming up feather down and quills.