BeWelcome - Open your door to the world!
DogBuddy - Find dog walking, dog sitting and dog boarding near you
Trustroots - Travellers community for sharing, hosting and getting people together.
Dogo - Positive dog training, make learning tricks fun
Couchsurfing - CouchSurfing is your ticket to explore the world -- from the road or from your own home.
DogSync - Make taking care of your dogs easy and communicative