2 drops ins/ 12 hours alone

I get there at 7am to walk this dog, and noticed he had a bad case of cherry eyes (French bulldog) but besides that everything went well at first. I communicated with the owner to see if I should leave the dog out as I only saw him drink water while I was there and I didn’t see him eat. She didn’t answer until I left to leave him in the cage. Mind you my next drop in was to be at 7pm. So that’s basically 12 hours of him in the cage. I should’ve never accepted this booking this is def my fault but at the same time I’m glad because now I’m aware that this is not a good owner and I contacted Rover but they want me to talk to owner about adding more bookings. I had to really push for her to add more bookings which is crazy because she really thinks this is normal. It sucks because once this booking is done, that dog won’t get the same treatment I’ve been giving it which it needs and will resort back to being alone for 12 hours a time. Debating on contacting a higher authority for animal abuse. Idk need some insight here.