Using the stat-system I explained above, let's have a look at Lovebunny and Slothbot:
Lovebunny is a WP-tank with 20 stats and Slothbot is a WP-tank with 21 stats.
We typically ignore the STR and MAG stats on these pets though, since they're useless here.
Slothbot has zeroed these stats, which typically have a minimum of 1. By doing this, Slothbot is +3 stats better in the relevant ones. And by being +3 stats better than a 20stat, we consider Slothbot to be a 23stat pet.
This concept gets complex rather quickly, once you try to expand it outside of Bot Pets, because when is a stat wasted, and when is it just placed suboptimally? Should a 20stat with one mediocre stat choice be considered a 19.5stat pet? It's difficult to say, so we usually only use the concept when talking about Bots and Bot-likes.