How the hell should I know? Dogs and Humans come in a variety of sizes and shapes. A long Dog (St Bernard) and a short Woman (4 inch virgin vagina) will definitely cause much pain for both parties. A short Dog (Chihuahua) and a long Woman (tall mother of 6) is more likely to be boring. Anything else between is possible. The only way anyone else can help you is to examine your Woman and your Dog with the goal of comparing measurements. Or you might try doing that yourself. There might even be some suggestions about that in the How To Section.