Ghost dogs in my kitchen

So I put the kids down for a nap and ran to smoke a joint in the bathroom. Mind your business on that one. Live in my shoes for awhile and you'd be trying to grow it just for personal.

When I came out and walked into the kitchen; I found these:

Now, for anyone who is blind or can't make out what they're seeing, these are muddy paw/foot prints on my kitchen floor. From what I can make out they were either made by a medium to large size dog or possibly even a small child walking on their tip-toes.

Just to clarify, I don't own a dog and the kids were down for a nap. I ran to get the mail so I know I tracked in mud, but I was wearing my crocs.

Mud:

Many chunks of mud:

Bottom of Crocs:	Size Comparison	Close-up

I've come to the conclusion that
1. I'm not crazy or tripping and
2. There's no way someone got into my house (all the doors were locked).
So if someone has a logical explanation as to how these showed up...shoot me an e-mail.

I'll believe just about anything right now.
For now ...I'll just believe I have ghost dogs in my kitchen.