Expand the breeds and add logic to predict mixed breeds. What you have might suffice with the expanded purebred list.
I used show pictures (puli PON frenchie) before stopping and looking at your list. Import from AKC/UKC or the international dog club database for a quick. The collaboration might be fun for both sides to get a quick expansion.
I disagree with putting highly sold without restriction mix breeds. Most puppy mill rescues I have worked with in the last 5-6 years are puggles doodles etc. and their poor parents. Most of my direct work is rescue and that would be too much information for people not willing to take responsibility for their dogs.
Fetch Support Team commented
Thank you for your feedback!
As you might know, you are seeing sophisticated artificial intelligence (AI) technology in action – and it will get better over time. We are also continuing to add new breeds that aren't currently covered.
Please note that we don't currently have any mixed breeds in our system!
Please come back and check again soon!
The Fetch! Team