Is there a way to remove certain words from strings.

Say the user enters "I have a dog and his name is Rover" in the text box, can I set it up so the program removes the words "dog" and "rover"

Also, can this be done using integers, so that say i have an integer "139547" and I want to remove the last 3 digits, and print the other numbers in a textbox, how would i go about doing this.

I am using VB4.0 if it matters.