What should I do if my client does not pay me and insist on direct pay?

Hello,

So one of my client just dropped off his dog Coco with me last night around 6PM. And as he was rushing off to leave he said that if it is okay for him to pay me directly instead of Rover as he is aware there may be fees that could be reduced. I said that it isn't okay because it wouldn't be safer for both of us. But he asked if he could still give me the cash and I pay Rover the fees. And I simply told him it wouldn't work that way. And he said that it is his first time using Rover so he doesn't have his credit card information on his account. I was nice and polite and gave him the Rover Customer service phone number and told him that they would be happy to assist him. Did I do a good job? He hasn't responded via text after I sent the phone number. Do you think there is a possibility that he may just run off with his dog back on Friday and not pay me? Or do you think he will just give me cash and be like okay bye! Thanks. :( I'm worried now.

I know I was supposed to have them confirm and everything first. But they didn't. It was literally him last minute asking me if I was available to take care of his dog and he just dropped it off. We didn't even get a chance to do a proper meet and greet because he was in a rush to leave and the dog slipped out of my apartment door and ran off. Thankfully he caught her and brought her back inside.

Any advice given would be appreciated. Thank you.