This statement is trying to say that domesticated animals and wild animals of the same species should behave differently. Indeed, behaviours of wild animals can cause trouble for domesticated animals as well as humans. For example, wild dogs tend to hunt with their sharp teeth and claws. They are aggressive towards anything they see moving. However, such behaviour in domesticated dogs cannot be allowed as this would cause harm to other animals and humans.
Every organism needs basic necessities such as food and water. They need to obtain these necessities in any way possible to survive. Neglected domesticated animals may tend to attack other animals such as birds or hamsters. Domesticated herbivores such as sheep or cows may attack other members of the herd to assert their status and dominion. According to some people, taming animals is unethical. They may argue that we alter animals’ innate behaviour to accommodate our wishes. Forcing animals to suppress their natural instincts is immoral. Together with this, people may debate that our love and affection for pets is the reason why their instincts have dulled.
On the contrary, it can be argued that the behaviour of domesticated animals must have changed over time. Humans also protect many animals from dying out. Our breeding programmes and laws have saved many species of animals from extinction. Therefore, human interference is necessary to protect animals to an extent.
Ultimately, domesticated animals are necessary for humans. Farm animals such as cows are needed to provide milk. Sheep are needed for wool in the textile industry. Dogs and cats are considered to be integral parts of families. Therefore, it is necessary for them to exist as they are valued by society.