I would be happy to help you do that although not knowledgeable in Affinity Designer (which I only have on an iPad) nor Inkscape. I’m an Illustrator person. If you don’t get any takers I could take a whack at it.
So inking one of your own dog’s paws won’t work? Just kidding. Please don’t jump off the cliff. There are folks here to help. I don’t have Affinity Designer, but what about one of the free images in the interface? @cynd11 has a really great thread, and she will help you. Win win.
I am sure all this can be done in AD but I did it in Inkscape in 2 minutes…
Draw a black square roughly the size of the stamp. Import/paste the paw image you want. Trace the bitmap. Drag the traced path over the square, and change the paw fill to white.
It worked! I didn’t get good ink on my stamp as the pad wasn’t wide enough. I ordered a wider one. I think I’ll get better coverage of ink and a better and more consistent stamp when I get that, but it worked!
Very cool. QR is a very forgiving code but I’m still amazed at some implementations. I would not have bet this would stand up to inking. Add another thing to the toolbelt