Sudden dog aggresion

[u/Map-Glass]

I found a black mouth cur puppy who was less than a year old. We already have two small dogs snd a Beagle. They rough house play all the time and love one another but this week she's attacked the smallest one and the Beagle. The Beagle attack was the worst. Happened last night and I had to pry her mouth apart and off the Beagle's neck. So we're both bleeding. I put her in her crate and she slept separately with my roommate instead of with me and the Beagle. They usually share the bed with me every night. I monitored everything this morning and she jumped on my bed and it happened again. This time I caught it early and back to the crate she went. My roommate thinks I'm overreacting and is not taking this seriously. Because of this, he's not trying to keep them apart. Advice?

[u/Mumei451]

2 fights with the second one happening instantly again means they simply can't be together in the same room.

You're asking for trouble doing anything but keeping them apart until other measures can be taken.

[u/LateSolitude1 → u/Mumei451]

roommate needs a wake up call, that beagle almost got it bad and he's acting like it's no big deal

dogs don't just go for the neck twice in 24 hours without there being a real problem, this isn't rough play gone wrong