If the self defense shooting is justified under the statutes, it shouldn't make any difference whether you hit the bad guy with just one round or 10rds, if it can be articulated that the bad guy continued to pose a significant threat. Same with the caliber, if it's justified under the statutes...
your finger pad placement on the trigger may also play a part (below is for 1911, but can be applied to other pistols as well)...
https://gunsamerica.com/digest/1911-trigger-placement/
I'm sorry for your loss Hayes. From the day we introduce into the home, we all know it's just a matter of time before we have to say good bye. We do what's best for them in spite of the pain of their loss. Remember all the good times with Rylee.