How do you go about dog boarding at your apartment?

I would be very careful trying to do anything under cover. Most apartments have a pet policy that needs to be followed. I fostered dogs when I lived in an apartment, so I'll tell you how we managed it. Our complex had a weight limit and you had to pay a deposit for each animal. I paid a deposit for one dog, and only took in one at a time within the weight requirements. If you wanted to watch two dogs, you'd have to put down another deposit for having the extra dog on the property.

They aren't going to keep track to make sure you have "your" dog and nobody else's, they just want to see that proper procedures are followed. Know the breed and weight restrictions, and follow the rules as closely as possible.