UPDATE: Thank you for all the thoughtful comments, particularly about the heat. Plus, Chewie has never been in the car for more than an hour or two. It was a happy, comforting thought, but Chewie won't be making the trip - he'll be staying behind with the menfolk. Mrs. G. will just have to hug and snorfle your animals to help ease the pain of his absence. Maybe Mrs. G. will bring a Teddy bear to ride along...yeah, right.
Mrs. G. has been thinking of taking Chewie on the road with her for companionship. He loves to go in the car and Mrs. G. loves his furry mug serving as her co-pilot. He could also keep the priceless, folkart Siamese cat painting company.
She realizes this adds an extra layer of difficulty to her trip but she's still thinking about it. She wouldn't have to bring him into anyone's house as he has a lovely crate and doesn't mind sleeping in it under the stars.
So here's where you (especially dog owners and lovers) come in:
Explain to Mrs. G. why this is a bad idea. It won't hurt Mrs. G's feelings. In fact, she's actively seeking honest, objective opinions as Chewie sometimes looks at her just the right way and she loses all common sense. Mr. G. has a similar effect as well. Mrs. G. really wishes she could throw him in the car!
So, what do you think? Lay it on her.