Lol okay so basically his brother only said that to traumatize chase making him think he really fucked that dog but he didn’t. He just spent that rut alone and because chase is such an innocent baby and love his pets his brother decided to say that he was so in rut that he fucked his dog. And seeing chase very traumatized his brother kinda just keep mentioning it for chase to start and mature and stuff.

So I think when Chase was in his rut(?) or something like that when his brother told him that he had $eggs with a dog I think it that time when Joshua and him ya know uehehe. I forgot some parts so just prove me wrong if I'm wrong. Just a thought lol. ( ̄へ ̄)