I think he made clear his intentions with Crispy when the police handed him over and he said something like "I don't want that fcuking thing".
If that's not enough evidence then refer back to last w/e of Jul when the Pargeter's stayed at WHF he said Crispy needed shooting! (CAL).
Why would anyone expect him to take in a dog he clearly disliked?
Conversely we are told when the police broke the news he vomited by thinking about his beloved Brambles.
He “appeared” to vomit, but the officers didn’t see any vomit...
That’s why he ran off to do his vomiting act...nothing came up
Besides, it would’ve been impossible to vomit with an empty stomach.
As for Crispy, he “forgot” himself when he spouted things like “shoot the f..king thing” etc...he hated that dog because he sensed Jeremy was evil and must have given him the evil stare while yapping at him.
JB can’t display normal emotions; so probably didn't think it odd that he’d want Crispy put down. That’s why he was so casual about it.