I'm not sure where you were reading that 10+ doesn't exist with dogs. But I can guarantee you it does. I am one of the most serious members on people proving their claims with real measurements because face it... some men seriously exaggerate what they are working with.
Still, I personally been with at least a handful that cross the double digit mark.
Some German Shepherds have freakishly long dicks, not very thick, but long. I also cared for a Malamute that was 11" long but thin dicked. I've had 2 Fila Mastiffs that rock double digits, one was also thicker than my arm. ?
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But the absolute biggest unit I have ever seen on a dog was an oversized Rottie. His cock was longer than a standard school ruler (12") held against it.