The only other Poirot novel except the Big Four, that I remember, where several short storys made a book, are the Labours of Hercules. Are you from this book?
Tommy is correct that it is indeed Amy Carnaby but ....
In fairness it was actually Christopher Wren and Mrs Blair and LL8 did who asked for most the clues. And CWren guessed Labours and Mrs Blair got Hercules and dogs first but didn't give the name.
Mrs Blair, I think you were much closer than me. I just thought about Agatha Christie books where several short stories made a novel and guessed them one by one. Then I googled as well, because I couldn't remember the stories in "Labours of Hercules". But by that time I have found it, you had already guessed, that she had stolen dogs. So I think it should be you, you were on the right track, and if we all used the internet, than you were the one, who used it first. :-)
Comments
It's not an easy first clue, but I'm sure the questions will work it out!
'I am a suspicious person'
Do you appear in a Poirot book?