I started working on the second Raiding with Leashes achievement.

When I enter some raids (e.g. Karazhan) the zone tracker appears properly and shows the pets I'm missing, but other raids (e.g. Serpentshrine) shows no zone tracker even though I'm missing a couple pets there.

As I'm typing this I'm not wondering if this is because some pets are "battle" and some are just "cosmetic" and maybe the zone tracker only tracks battle pets. Is that the issue? If so is there a way to also track non-battle pets?