The new animal lore gump provides all the information about a creature in a single page.
For each stat you can see the value and the maximum value inside the brackets. If you don't understand what a symbol means you can just mouse over it to get a tooltip that explains it.
You can customize the highlight color of the stats from user settings -> options and set at which percentage a stat should be considered bad (yellow) or very bad (red). The percentage is calculated between the minimum and maximum possible value.
On the top-left you can see an emoji indicating the current loyalty status from wild (devil) to wonderfully happy (green happy smile). Near the loyalty you can see the creature type (determine by the body type ID) and the color ID. For some creatures the body type is shared, so if it has been renamed you may need to click the name to swap with the correct type.
On the top-right you can find the save button near the X to close the gump. Use that button to save a text file with all the current pet data. CTRL + CLICK that button to report the animal for verification, do that if you notice something wrong with the maximum values.
On the right of the control slots, you can find the rating stars (this uses the Khyro's rating system). Mouse over the stars to get the intensity details.
From User Settings you can disable Khyro's rating system for the old basic system that only considers min/max possible (only reliable if you play on freeshards without the new training system).
The rating system is disabled for trained pet because there is no way for the UI to obtain the original pet stats necessary for the calculations. However, you can always save the pet stats on a file after taming and manually enter them on Khyro's website for a trained pet rating.
On tamed pet you have 3 buttons on the top-right:
The weight button provides a tooltip with the weight of all the attributes for training (so you can see how much did you use). The cap button provides a tooltip with all the creatures training cap on stats and resistances. The arrow button is there to begin training or enter the pet training options. A white text on the right indicates which one is it. Under this white text you can find the "cancel training" text button.
At the bottom of the window you can find the Special Abilities and Pet Advancements tables:
The Special Abilities table indicates the currently active special abilities for the creature. The abilities listed with a light blue text are the innate abilities of the pet, the rest has been added through training.
The Pet Advancements table indicates all the abilities you added since the first training of the creature (including the removed one). It is useful when you are buying a pet to check if the training went wrong somewhere and points were wasted.
The current training progress can be seen in real time from the pet healthbar (the blue line under the hp is the training progress):
Additionally if the healthbar shows a star on it, it means that your pet is currently in a "pet power hour" that increases the training progress. Mouse over the star to learn how long the effect will last.
Sometimes the server fails to send updates for the training progress of a pet. If that happens you can update it manually by using animal lore on the pet.
Like many windows this one is also affected by scale and alpha mode.