A snake is a loathsome creature, hated by many and loved by few. It is hard not to demonize them in any tale in which they appear because of their slippery nature.
Dead snakes are an important dream symbol because of all of the meaning they carry behind them. Little details such as the patterns and markings can also mean important things in their own right. Whether the snake in the dream is venomous or not can also be important but the most important factor by far is how large the snake is. If you are seeing small dead snakes then this has little significance but seeing a very large dead anaconda can have great meaning.
Snakes are known for being manipulative and for being tricksters all thanks to the biblical tale, therefore when you have a dream involving dead snakes it means that there is some influence in your life that has been pushing you towards dishonest which is now gone from your life. You do not have to worry about him anymore because he will no longer be bothering you or manipulating you into doing things that you might not want. It could also mean that that rebellious dangerous streak within yourself is now gone because you have grown out of it. This is also quite possible when you have a dream such as this.