Hi there, newbie here looking for advice. We have a 3 year old lab cross, his name is Dudley, who is the gentlest soul, very non-aggressive or confrontational. We also have a 7 month old pug male named AJ. He’s been raised in our house from birth so known us & Dudley’s scent from birth. First introductions were made at 6 weeks. They’ve always been very happy together, enjoy gentle play, in which Dudley lays down to play and it’s never escalated into humping or over excitement. But this last month AJ has taken to really snapping at Dudley’s testicles, unprovoked. It’s making them very red and sore, making Dudley yelp, yet AJ just goes for a second bite & isn’t reading the cue that it’s too painful. We tell AJ no, firmly, and his ears go back like he knows it’s wrong. He’s then sent to his bed for time out. But this doesn’t seem to be putting him off. If anything it is getting worse. Tonight Dudley approached me when I entered the room and AJ latched on to his testicles from behind. We instantly corrected the behaviour but I’m kind of at a loss as to why the corrections aren’t working. Any advice would be appreciated? I don’t want to have to get Dudley ‘done’ because of AJ.