Tapas traveled with me on a recent work trip to Idaho (11/9 to 11/16). He was great to travel with, and pretty much sat in my lap the whole drive out and back. Everything I needed for him fit in his travel bag, and he was well behaved. While there, he got to experience snow for the first time. He also met Skippy: the chihuahua that convinced me to get Tapas. Tapas and Skippy are almost exactly the same size. We put their sweaters on later so that they wouldn't get too cold. When it got colder the next day, I let him play outside with his parka.
Let this be a warning for anyone thinking about a toy dog! They are more devious in their cuteness than a kitten. You will soon be spending absurd amounts of dollars on their clothing and care. The upside is that they are so cute and lovable.