I'm sure house pets like cats and dogs maybe they would like to go out sometimes but they have a nice comfortable life inside the house, safe away from harm, things like that so it's a trade off.
The trade off is that the adaptive response relies on cells being primed or activated, so they can fully differentiate into the right kind of fighter to kill that pathogen, and that can take a few weeks.
These techniques all have their own trade offs, and when we evaluate them, we often use terms like first or second-order accuracy, which are mathematical terms.