Dogs most often listed for sale or adoption

From ANIMAL PEOPLE, July/August 2012:
Dogs most often listed for sale or adoption
2010 2011 2012 Avg. Ppltn.
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Large retrievers 8.7% 5.2% 8.2% 7.4% 5.2 m.
Pit bull class 4.1% 3.3% 4.6% 4.0% 2.8 m.
Small terriers 2.2% 2.1% 2.1% 2.1% 1.5 m.
Poodles 1.4% 2.0% 2.8% 2.1% 1.5 m.
Setter class 1.0% 2.3% 2.3% 1.9% 1.3 m.
German shepherds 1.7% 1.4% 2.3% 1.8% 1.3 m.
Spaniels 1.2% 2.0% 2.0% 1.7% 1.2 m.
Beagles 1.2% 1.2% 2.3% 1.6% 1.1 m.
Chihuahuas 2.4% 0.7% 0.4% 1.2% 0.8 m.