What's the difference between because and for?
When I do proofreading, there are two sentences that made me confused:
1. Many owners feel their pets understand them, because animals are quick to sense anger and sorrow.
2. But it is fatal to let any dog know that he is funny, because he immediately loses his head and starts overdoing it.
In these two sentences, because should be correct into for.
But why? Why because is wrong in these sentences? When should I use because and when should use for?