How long does it really take?
Most people are live in two to three minutes, search your business, pick a style, publish. There is nothing to install and no signup needed to see your site first, because it is built from your Google listing rather than from a blank page.
Is it free?
Yes. You get a live site on your own name.clay.site address with a small badge in the footer, and nothing expires. The paid plan is your own domain, the badge removed and the pro features.
Do I need any tech skills?
None. If you can type your business name, you can build a Clay site: the live page is the editor, so you tap the thing you want to change. There is no code anywhere, and nothing to install or keep updated, see the WordPress comparison for what that saves.
Can I use my own domain?
Yes, buy it wherever you like and point it at Clay on a paid plan; the certificate is issued for you. Until then the free name.clay.site address is a real one you can print, and it keeps working afterwards.
Do I need to list everything I stock?
No, and a full list is wrong within a week. Brands, the specialist diets by name, and a line saying you order anything in answers the actual question.
Can people book grooming?
Yes, and it is the part of a pet shop that fills a diary on its own once it is bookable: how appointments work.
Should I sell food online?
Only if you deliver locally. A shop that people drive to is better served by a page that says what is on the shelf: what a shop band adds if you do deliver.