It would really help to have more information.
What were the circumstances of the attack? Was it random? Was there a toy or food nearby?
Where were you during the event? How did you introduce them when you brought pup home? Do they have separate crates where the dash knows he can escape the crazy puppy?
How severe was the attack? Was it an older dog correcting a puppy? Or was it aggressive? How nasty did the dash get? Is he okay with other dogs?
All of these details will help people know if it's due to resource guarding, dog aggression, or just adjusting to a new puppy.
And definitely keep them separated until you can figure the whole thing out.
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