Hardwood floor refinishing - large stains

[Sylvia Schumacher]

Hi!

I got help refinishing hardwood floors but after sanding, there are quite large areas with (pet?) stain left. The professional recommends to replace the blanks and quotes me 350$ for it. I was planning to bleach it and put darker stain on it but wondering whether it's still worth it. It's a SFH in a C-grade neighborhood in Cleveland.

Would appreciate any recommendations on what to do here. Is the price reasonable?

Thanks,

Sylvia