Nice research -) Actually I don't know what are they burning in their rituals either.
But you gave an example with very interesting russian word which even natives are getting confused with. Ванна/ванная.
a. Ванна - 1. Bathtub
2. Bath
b. Ванная (комната) - Bathroom
But in everyday speech you may use ванна instead of ванная and it won't be a mistake (unless you're on your exam in Russian
You should say "Наша собака убегает от ваннЫ..." (I guess it was a misprint) or "Наша собака убегает из ванной (ванны)..."