You never need to cut a hole in a glass door for a doggie door, and it would be suicidal to do that. If you examine the glass doors, you will probably find that the one that doesn't normally open can actually be slid away from the door jam by removing some screws. Then all you need is a panel to fill that opening.
If you have the ability to do this yourself, go down to lowes and buy an white MDF 12"x8' shelf. Cut it to fit the opening and then cut the appropriate hole in it for your doggie door. Or hire a handy man to do it for you.
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