I have my own dog and I've taken care of her for 10+ years. I take her on walks almost everyday. She's getting old and I have to watch her more consistently to make sure that she's doing alright ( Ex: Coming home right after school to take care of her, checking on her at night. ) And I've definitely had experience cleaning up after her at times. I walk her about 2-3 miles when we go on walks so walking a dog for 30 minutes will not be a problem. I've also taken care of many of our neighbors dogs my whole life. Every time they go on vacation, they ask if I'm available.