Is it conscionable to keep any animal as a pet?

Is it conscionable to keep any animal as a pet?

The Independent

'Dogs and cats are fine, fish maybe, and snakes and other more exotic animals probably not.' That's about as close to a consensus as we have for the domestication of animals, but they are judgements largely based on history and tradition and imply that freedom and space are more important to some animals than others.

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