The formalization of these ideas began in the 19th century with the founding of the RSPCA in the UK (1824) and the ASPCA in the US (1866). However, the modern movement was ignited in the 1970s by thinkers like Peter Singer, whose book Animal Liberation argued for "sentientism"—the idea that the ability to feel pain should grant an organism moral consideration. This was followed by Tom Regan’s The Case for Animal Rights , which moved the needle from avoiding suffering to recognizing inherent value. Key Battlegrounds Today
The question is not if the line will move, but how fast .
create exceptions to the property rule. They say: "Yes, the farmer owns the pig, but the farmer is not allowed to whip the pig bloody." Welfare laws regulate how you treat your property. This is a "protectionist" model.
: An updated model that expands on the Five Freedoms by emphasizing an animal's mental state and positive experiences.