Hello everyone, I’ve been trying to get rid of our dogs agression for years now. It’s 6 years old jack russel terier. He’s sweetie, he is playful, cheerful and really kind, but I fully don’t understand the reasons behind his behavior. I hardly know what triggers his agression. Usually it happens all of suden. For example he came to me playful, waving his tail, wanting to cuddle, we cuddle, he’s licking me, he’s happy and then he snaps all of sudden. He used to even bite, but now he only snaps. I’m trying to understand what triggers him, but it’s really hard for me to understand the reasons behund this so I can avoid such a situations. I’ve had 3 dogs in my life so far and none of them never showed such a behavior and they were well behaved. He’s like something goes wrong in his mind all of sudden and he goes crazy for no reason. He goes from happy to agressive monster in 1 second. I’m really woried about this and don’t know what to do. I usually try to calm him down, screams no and give him shower which calms him down, but I just want to get rid of this behavior of his. Is there any way?