from what i remember it takes a long ass time, almost at the very end of the story. josh is afraid of chase's reaction. so he decides to keep it to himself, almost to the point of chase's wanting to kill himself because of his trauma. only after that josh finally decides to tell him (i was so annoyed at his ass, like..... why make him suffer like that bitch)
In the last chapter of the main story, when he tells him the truth about Pete.
Chase first asks him if he raped him.
Chase knew that he slept with an omega back then. He actually searched for him for some time, but couldn't find him.
The dog thing was his first rut. Grayson had nothing do to with what Chase thought of the first night with Josh.
But the dog thing concerning his first rut came up while they talked, and Josh told him the truth about that, also that they always took his pheromones out by injection. But Josh knew that for some time, since he had that talk with Grayson before Chase was kidnapped.
Dane will never leave Grayson, they are like a perfect match, both crazy enough to live happily with the other.lol

I need to know this, when will chase find out that he actually slept with Josh back then?
And what is his reaction when he finally realizes he slept with Josh, Not with a dog? that ahole Grayson gaslighted Chase into thinking he slept with a dog not a human. (That's how his phobia of dogs started)
Dane, leave that ass Grayson. I could do better than him