You don't need spoilers to know that the dog sex never happened like based on the context clues is obvious what they meant by that time is when Joshua and him had sex
I mean... not quite on point there... but I guess close enough?
I'm fairly certain those are two very different timelines, but you can tell the dog thing never happened just by the way his brother refers to the situation. He's being way too vague.
You don't need spoilers to know that the dog sex never happened like based on the context clues is obvious what they meant by that time is when Joshua and him had sex