It is very tragic indeed, and I hope that none of the animals - cavy or otherwise - suffered, but died almost instantaneously due to inhalation of toxic gases. Naturally, we can only speculate as to the store's breeding practices. However, if the store practiced the common unethical practices that a majority of us are aware of, these animals may be the fortunate ones. Regardless, it upsets me greatly when I think of their last moments. I really do hope that this was not an arson attack!