
spoilers ! !
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basically the reason he has a trauma with dogs is because grayson said that he slept with a dog during the rut. the said rut is the rut where josh and chase had sex. and chase doesn't remember who he had slept with so to taunt him, grayson said he slept with a dog instead.
real fucked in the head brother right there.
and chase is a virgin. his first time was with josh (during the rut)

Is the translation really that bad? Because I read it now several times. It was his first rut, not the one with Josh. Grayson tells Josh about it in volume 3, when they run into each other in the hospital where Josh wants to pic up the medicine for Chase.
...............................................................
“When his first rut came, Chase had no partner. He was a shy
adolescent boy.”
It was an unbelievable expression for anyone who knows the man
now. ‘Shy adolescent boy’. Grayson sighed and opened his mouth
to Josh, who was waiting silently.
“I took Alex in a hurry, but it wasn’t very useful. Even if Chase
couldn’t erect and just fainted, I had no choice but to take him
with an injection. After opening his eyes, he couldn’t remember, so
I just said…”
..........................................................................
Chase actually remembers that the dog was present and believed the bullshit Grayson told him. And Grayson is now using it to "help" Chase. One of Graysons biggest flaws is, that when he tries to help someone, he does what he himself think will help, which often is more harm- than helpful. What is really conflicting about it, is that Grayson really thinks that it helps, so there is no mailice behind it.

His brother is not evil, his brother is emotionless, he was born as an extreme alpha -violet eyes and pheromone scent = unable to understand emotions. And he tends to try to help others in a not-helping way, he really isn't aware that his helping often is the opposite of helping. Even Dane just told him that he should stop with that.
Help me out a sec. Was it true that he slept with a dog during is rut or not? I don’t remember (/TДT)/