I think that Pettalkville should be in a very special valley, known only to animals and the people who love them. It would have mountains to the north side, with plenty of snow for the huskies and Saint Bernards year-round, but never be so cold that people would be uncomfortable.
On the south side of the valley, it would be very warm year-round, nicely so, so Chihuahuas and Cornish Rexes, as well as lizards and reptiles, could go outside without being too cold. Perhaps the southwest part of the valley will be desert, like Arizona, and the eastern part of the valley will have temperate climate, so people and animals who love the seasons in New England would be happy there. In the heart of the valley, it will be warm, but not muggy, sunny, but not dangerously so, and there would be a big lake for water fun for everyone. And on one side it is bordered by the ocean, so dolphins and whales can visit, and have a safe harbor.

How about that? (And Elvis can come visit when he tires of Graceland.)