How do I ask another sitter on Rover.com to leave a review?

I watched a dog for 4 days. The owner happened to be another sitter on http://Rover.com. All was fine. He hasn't left me a review yet, and this is really frustrating, as he knows the importance of the reviews. If there was an issue, he certainly hasn't told me. I told him I enjoyed his dog, but also did let him know that the dog pooped 2x in the house, through no fault on my part. Just wanted him to have the info. I was/am willing to watch the dog again-he is sweet.
The day the dog was picked up I sent an thank you email and asked if he could please write a review. (I totally forgot to mention it when he picked up the dog). I followed up 2 days later with another request for a review. Any suggestions?