Classic opposite of the blanks question

Blank 1 mentions that the ______ young spaniel was 'FINALLY' ______

This indicates that the dog after going through some months of training is finally transformed into something else, or has been trained to become more ________

Now let's look at the blanks -
Vigilant - Means observant or always on the lookout (Doesn't fit)
Placid - Calm, Tranquil (Completely opposite of what we should be looking for)
Boisterous - Noisy, Intractable (Fits perfectly)

Now automatically blank 2 should be the opposite of the blank 1. So if the Dog was uncontrollable, feral, noisy, obdurate, in the first blank, he/she is now tamed, tractable, obedient, domesticated, docile.

Hence Docile fits perfectly

Best