Cloned animals

Cloning illustration - two toy cows in petri dishes © Andrew Forsyth / RSPCA Photolibrary

How are animals cloned?

The cloning process usually involves removing genetic information, known as DNA, from a cell taken from one animal and placing this into an unfertilised egg that has had its own DNA removed. This egg is then artificially stimulated to start developing into an embryo and placed into a surrogate mother. See our simple graphic: The cloning process (PDF 82.8KB)


  • The first cloned mammal successfully produced using a cell taken from another animal was 'Dolly the sheep' - born in 1996.
  • The growing list of species to have now been cloned includes mice, pigs, goats, dogs, cats, horses and mules.
  • Fewer than five per cent of cloned embryos usually survive to birth.
  • Where animals are born alive, they often have breathing problems, tumours, liver defects or other abnormalities, and have a reduced lifespan.

Why are animals cloned?

Cloning techniques are used to try and produce exact 'copies' of a particular animal. The use of cloning technology is often justified by statements that the research could lead to cheaper methods of producing medical treatments and food products.

Cloning techniques have also been, or are being used, to create 'copies' of: 

Can there be any justification for cloning animals for such frivolous purposes?

What we think

Cloning is a serious concern. The process involves scientific procedures that can cause pain, suffering and distress. We believe that animals are often being cloned with little consideration for ethics or animal welfare.


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