Hell no. I never gonna boycott Sergio Leone or his movies.

It's really easy to know If you do a search (something like "movies real animal cruelty), you can find several sites where these films are listed, such as this one:
http://rateyourmusic.com/list/titusfox/animal_cruelty_in_films/
On IMDB, you can do a tag/keyword search.
http://www.imdb.com/keyword/actual-animal-killed/
Boycott movies that involve real animal violence! (and their directors too)

I don't know about the Russia's Toughest. I'm sure it will appear sometimes. But I have question about your signature. How I'm supposed to know if the film involved real animan cruelty or not. They usually don't mention in it trailers. I'm not sarcastic (maybe little bit), I'm against animal cruelty too.
Please, visit my Hell Hole. Thank you!
http://prguauk.myminicity.com/