Today I was reading The Quest for Anastasia, Solving the Mystry of the Lost Romanovs by John Klier and Helen Mingay and it says when the Whites arrived at the Ekatarinburg a guard named Mikhail Letermin found Joy, the King Charles Spaniel "waiting patiently outside teh royal rooms on the morning of 17 July. You'll be waiting a long time, he thought, before deciding to take the animal home." (pg 55)
And in the same book on pg 73 it says " The most important and poignant new find, made on 25 Jul 1919y, at the bottom of the open mine, was the body of a small dog, wich witnesses identified as that of Jemmy, Anastasia's lapdog."
In that part of the country it doesn't get much over 65F. So, a year later, so, 5 of the moths, it was bellow 32F or 0C and then 4 more of the months it was colder than the avarage refridgerator (sp). It could be the reason the dog was not totally decomposed in a year.