The Contrail is definitely a palace -- bigger inside than the Moment. Your dog can curl up at the bottom where it tapers down.
Honestly, the Contrail is fine in wet weather. Try to avoid pitching near water, and you won't get much condensation, except perhaps on very windy nights. In windy weather, pitch with the narrow end into the wind, and pitch the bottom low.
Really, it's a fine tent for the weight and the price -- my workhorse tent.