Dogs most often listed for sale or adoption

From ANIMAL PEOPLE,  July-August 2013:

Dogs most often listed for sale or adoption                              2010  2011  2012  2013  Avg.  Ppltn.

Large retrievers       8.7%  5.2%  8.2%  8.2%  7.6%  5.3 m.

Pit bull class           4.1%  3.3%  4.6%  6.0%  4.5%  3.2 m.

Small terriers          2.2%  2.1%  2.1%  5.2%  2.9%  2.0 m.

Collie class              1.3%  2.2%  3.4%  4.1%  2.8%  2.0 m.

Poodles                   1.4%  2.0%  2.8%  2.8%  2.3%  1.6 m.

Setter class              1.0%  2.3%  2.3%  3.6%  2.3%  1.6 m.

German shepherds     1.7%  1.4%  2.3%  2.1%  1.8%  1.3 m.

Spaniels                   1.2%  2.0%  2.0%  2.0%  1.8%  1.3 m.

Beagles                    1.2%  1.2%  2.3%  2.0%  1.7%  1.2 m.

Chihuahuas               2.4%  0.7%  0.4%  2.6%  1.5%  1.0 m.