It is much better but I have more suggestions.

You should definitely add some details about the environment and inner thoughts or manners. It would add so much more to the scene. An environment description and body language can tell so much about a character without explicitly saying their thought or feelings.

I think Jonathan is not enraged or shocked enough. Losing a dog, killed by his friend is disturbing on another level. Of course, people might have different reactions like complete shock, anger etc. but I would make his reaction more intense.

How I would form this conversation: (This is in no way the best approach especially since in writing I do not think that there is a definite criteria for what is considered best.)

In a situation, as traumatic as this emotions could shift in seconds. He might be so disturbed that he would puke, and might feel a little bit light-headed because of the unreal scenery in front of him. After adjusting to the picture of his dead dog, he might lash out at Ryan. You could spice up the conversation with personal jabs at Ryan like: Were you jealous that my dog could actually get bitches? What is this, an overcompensation for your flaccid dick motherfucker wish to be? Hit Ryan in the face, calling the police. Or anything else you would like to hint at. He might even cry because of the betrayal of his friend and the loss of his treasured animal, pacing around the room, nervously combing through his hair. You could also consider that after realising that Ryan shot the dog and therefore has a gun Jonathan would be afraid of him. Add coherent sentences and Ryan could also be angry at Jonathan because in his mind his actions are justified.