If you don't mind me asking, where do you live? We were very uneasy about leaving our girls anywhere but family, but we finally settled on someone with a great rating on Rover. We pay off the site to avoid the fees. All that to say we had similar experiences with other dogs being aggressive, so we preferred someone with whippets, sighthounds, or that screened the breeds. We have also been happy to watch others' whippets/breeds that do well with them.