How will the dog walker get into my home?

You will have to give or leave them a key or leave a door open.

It's up to you to figure out how the dog walker will get into your home.

You have to decide that. Most clients give me a key. Some have a keyless entry that they give me a code for. If there is a physical key exchanged, you need to discuss how the key will be return at the end of the visit.