The pet is from around 2013 or earlier. I got it from an evolving a drake - no DM tinkering involved, only the common wands that are avaiable through crafting and addy coin shope. In a sdat.xls from 2015 dmg was 5d7 for black and red dragons - might have been changed in the mean time.
I am pretty sure it was originally a red dragon.
Here the stats in 2015:
HP AS AC dmg sight speed int
Red Dragon 650 40 40 5d7 5 600 800
Black Dragon 700 35 40 5d7 5 400 700