yes, dogs/cats + snake is always a risk, and your dog paid the price of your risk-taking. i hope the pupper is doing well and you learned something from the incident.

now, i don't own a boa but there are some things i feel comfortable enough to answer here:

i think you're dealing with a bit of anxiety and it's affecting your relationship with the snake. i have dreams where i'm basically neglecting my animals, forget i own animals, or sometimes the animals are maimed or dead. these dreams are essentially nightmares and take time to shake off. i think this nervousness is affecting how you view some of your snakes behaviors; i think you're reading too much into some things.

NOW, this isn't to say you're just imagining everything: an uncharacteristic strike out and the incident with your pup are definitely something to be concerned over. i'd double- and even triple-check husbandry as step one. could the snake be grumpy because their home is uncomfortable?

since you just upped prey size, is it possible the snake is still hungry/not full from their meal? again, i don't own a boa so i'm just making guesses.

i hope boa owners will chime in, and i hope i helped in any way!!!