Which of the following animals would most likely be identified using a microchip?

Microchipping is a common practice primarily used for identifying pets, particularly dogs. A microchip is a small electronic device that is implanted under the skin of an animal, allowing for unique identification and easy recovery in case the animal gets lost. This method is popular among pet owners and shelters, as it provides a permanent form of identification that is more reliable than collars or tags, which can become lost.

While other animals listed, such as cows, pigs, and chickens, can also be identified using different methods like ear tags or tattoos, microchips are not typically used for these livestock species due to various factors including cost, practicality, and the specific identification needs of these animals. Livestock generally have higher numbers, and alternative identification methods are more efficient for managing large herds or flocks.

In contrast, dogs are often individually owned and have a higher likelihood of being lost or straying from home, which makes microchipping an essential tool for ensuring their safe return to their owners. Therefore, dogs are the most likely among the options listed to be identified using a microchip.