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"Pet Training: Pre-Publish 97 & Store pets that start Animal Training may have their pet slots updated based on their pet strength and will be given a warning before proceeding. Pets will no longer be able to start training if it will result in the pet being over the max cap."

This is a vague statement that when read at face value seems to imply that all "legacy" pets will be updated due to their high intensity value.  However, upon further examining and testing, there is only a few animals that this particular note is directed at.

This article lists the mana cost of all pet abilities in Ultima Online.

Testing the following Patch Notes:
Pet AI: Added visual effects for the following abilities: Angry Fire, Cold Wind, and Raging Breath.
Pet AI: Scaled up damage on the following special moves: Cold Wind, Steal Life, and Raging Breath.

Pub 100 Added Visible Skill Caps for All Skills

Testing the Patch Note for "Pet Training: Reordered Special Move list."

Meet Khyro!

A visual comparison of the various color, hues, and types of Nightmares in Ultima Online

A visual comparison of the various color and hue types of Frost Dragons and Cold Drakes in Ultima Online.

Meet Rhyko!

A visual comparison of the various color and hue types of White Wyrms in Ultima Online