We keep pets just for our own fun. But animals are at the same time beings with needs and wishes that must be considered. But sometimes we are not as considerate towards animals as we should be. Animals are sometimes exploited. Animal breeding is not always what it was 50 years ago.
Production of food has to be cost-effective.
Slaughter and transports of the animals are not always carried through in a way that is the most considerate towards the animals. Bad hygienic conditions have sometimes caused animal diseases and contagiousness. Principles on animal welfare have not always been followed. At the same time people in Europe have raised a consciousness of the needs and wishes of animals. Animals have to be treated in a way that is ethically and morally acceptable.