They are foods without Chametz. Chametz is anything with flour that was let to rise. Kosher for Passover food must also be processed within 18 minutes so the dough doesn't have time to rise. It also has to be uncontaminated with dough that is not kosher for passover anymore and there needs to be a thorough cleaning between each batch.
There are two options for Passover, you can cook food for your pets or you can purchase kosher for Passover pet food. Please see the related link for a list of approved pet foods.
Kosher for Pesach (Passover) food is marked as such on the package label. Markings include a P incorporated into the hechsher, the words 'Kosher for Passover' in English, and 'Kasher l'Pesach' 'כשר לפסח' in Hebrew.
Yes. It should be labeled as having had rabbinic supervision for passover use. Note that Kosher for Passover certification is distinct from the Kosher certification that non-Passover wines may have.
Eggs, they also eat unleavened bread (bread without yeast)
Yes, and most cat foods are NOT kosher.
They have to shop for Kosher for Passover foods and clean their homes of ALL regular bread and bread products.
It would have to be certified kosher for Passover.
As soon a passover ends, leavened foods are again permissible, subject to other general kosher laws.
The label has to say "Kosher for Passover"
Yes, only if they are specifically certified kosher for passover. You can find kosher for Passover olives at any Jewish supermarket
It can be, it would require a valid Passover hechsher.
Yes, it can be since it is made from wine, which can be Kosher for passover if created under appropriate supervision. The bottle would require a kosher for Passover hechsher.