How? - Wha--?

I had a visitor in the wee hours. I'm trying to figure out where he got into the house. He was really bookin' until he hit the rug where the dogs' dishes are. I checked the pipe and wire holes in the floor, no shimmer. Hmm... could he have hitch-hiked in on my boot or one of the dogs?

I seriously thought I was done with these squishy, slimy devils - at least until the weather warms up in the spring. Ish!