Joey's breeder is a show breeder and she said the secret show breeders use is to have a "pee string". You keep the hair on the penis about 1-1 ½ inches long, you can make it's thin though, like an artists paintbrush. This string directs the flow of the urine away from the body, and you won't have any splatters. This link gives more details, read "Trimming Urination Area of a Dog."
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