the "pooch test" in goats?

[ErinMattW]

Hello I have a 8 month old boer goat who we have had with a buck for a month and a half now but he will be going back home next week I never really noticed her in heat but this is all new to me. I have read that you can tell if she is breed by the "pooch test"? But I'm not any good at this if someone could help me please!! Thank you