Sparky turns 10 months today. Per sources online, its the peak of Testosterone levels. This is an interesting comment. I have noticed recently that he had "frothing" around his mouth when we walk. I'm like no way he's turning rabid. However he can sit and watch another dog go by and not pull until they are well past us. No crazy pulling and dragging me on my butt yet. There is an increase in sniffing the air and every pee spot in the area.