This needs Carrd’s Embed element, which is on Pro Standard and Pro Plus. It’s not offered on the free plan or Pro Lite.
- In the builder, add an element and choose Embed.
- Set Type to Code and paste the Snippet.
- Set Style to Hidden and Location to Body End.
- Publish. Embeds don’t run inside the builder, so check the published site.
Your line
<script async src="https://cdn.sitepets.com/v1/pet.js" data-key="sp_YOUR_SITE_KEY"></script>
Once it’s live, Claim your Pet from the browser you copied the Snippet in.