Petr Petrovich Sokolov ( 1821 - 1899 ) was a Russian painter. Petr Petrovich Sokolov s works have been put up for auction numerous times, with realized prices surpassing estimated prices, varying from 4169.08 USD for Troika in 2005 to 19570.91 USD for TRAINING OF THE DOGS in 2013 , based on the size and medium of the artwork.