Don't display data with equal value from two tables

[fauowls]

I have a query that pulls data from 2 different tables. The query should display two columns made up from data of the two tables. Some of the data in the two tables are equal. How can avoid from displaying equal results.

Dog	Cat
Dog	Dog
Elephant	Cow
Cow	Chicken
Dog	Chicken

I do not want to display the result in row 2 seeing that both are equal.

[Bob Fitz]

Can you show us the SQL of the query that gives the results shown in your post.