People are just giving data without knowing it, it's probably not from Whatsapp, or e2ee is broken and back doored, which would be surprising even from Meta, however they probably search something on Google, Facebook Marketplace and whatnot. Even your virtual keyboard might be taped by Google or others.

Where did they download the dogs pictures in the first place? Probably be the leak source.

Don't FUD about your messenger spying on you, they pribably does but everything else is at well.

You can also use #GrapheneOS #Signal #SimpleX #searNGX and adblocks everywhere possible, then this might stop or at least be less frequent (or in worst casr you just don't see the ads).