Both my dogs, Star and Cody and my kitties, Mr. B and Oliver love to be around my 2 piggies, Squeekers and Moon! The dogs will sit by their cages, and just as you described, the piggies come out of their igloos and put their noses to their cage bars. The dogs and kitties all sniff at the piggies and the piggies wheek away! Oliver especially loves the guinea pigs. He will lay next to their cages for hours, all stretched out, belly up and purrrr away. When the piggies hear him purrring, they start cooooing! It's so cute! And one piggie, Squeekers, LOVES to hear the dogs bark! He cooos and popcorns, even when he hears them barking downstairs!