Believing in pet training had always been somewhat of a "leap of faith" for many people. With the animal lore changes brought about with Publish 16 (June/July 2002), it is easier than ever to see.
Each pet type can excel only in skills that they use. A unicorn cannot learn poisoning, nor can a frenzied ostard learn magery. Most pets can only excel in 4 total skills: wrestling, tactics, magic resist, and anatomy. In addition to those 4 skills, magical creatures can also raise the following: magery, evaluate intelligence, and meditation. Poisonous creatures can learn the first 4 skills, with the addition of poisoning. If the pet cannot raise a particular skill, then it will appear as "---" in the lore information.
Pets raise their skills at an accelerated rate compared to players. However, they do not use GGS.
Please note that at this point in time, pets can only be trained up to 100.0 in any skill. For pets that have above 100.0 in any skill, such as resist on fire steeds, they cannot be trained any further in that skill.
Resist and damage types cannot be raised on pets. Damage types will always be the same for every creature type, but the resist values will vary between species, usually within a 10 point spread.
Pets should not be put against the strongest creature they can handle. Instead, they should fight things that pose some challenge for the pet's current skill level. Ideally, you want to train a pet on something within 20 points of the pet's skill for tactics or wrestling. For resist, seek out a monster who's magery is about 5-20 points below the pet's resist. Like players, they only gain skill with each skill use success. Don't forget that pets can be trained against other tameables as well.
There is no difference whatsoever between training a chicken and training a dragon. They need to be trained in a way that 1) won't get them killed, and 2) is challenging enough to raise the pet's skills without being too difficult. Pet training is done in the exact same way a player would train their characters.
The higher your pet's wrestling is, the less often it will get hit. You should find opponents for your pet that have a similar wrestling skill level as your pet for best gains. If you lack 110+ animal lore, you can find a small sampling of popular monsters and their skill levels here.
The higher your pet's tactics, the more damage your pet will do (it is a percentage based bonus). You should find opponents for your pet that have similar tactics skill level as your pet for best gains. If you lack 110+ animal lore, you can find a small sampling of popular monsters and their skill levels here.
The higher your pet's resist, the better your pet will resist certain duration based spells. This skill can either lessen the effect of the spell or shorten its duration. Pets' resist will only have a chance to raise when hit by resistable spells. Spells that can be resisted are: Clumsy, Mana Drain, Paralyze Field, Weaken, Curse, Mana Vampire, Poison, Feeblemind, Paralyze, Poison Field. The following necromancy spells can also be resisted: Blood Oath, Mind Rot, Corpse Skin, Pain Spike. You should find opponents for your pet that have about 5-15 less points of magery than your pet does for best gains (ie. if your pet has 80 resist, find something that has 65-75 magery). If you lack 110+ animal lore, you can find a small sampling of popular monsters and their skill levels here.
The higher your pet's anatomy, the more damage your pet will do (at 100.0, it will give your pet a 30% damage bonus). This skill raises passively any time your pet is melee fighting.
The higher your pet's poisoning skill, the more frequently your pet will inject poison. If they have 99.0 poisoning or better, they have a chance to inflict one level of poison higher than normal. Poisonous pets will be immune to the level of poison they can inject and all lower levels of poison. This skill raises passively any time your pet is melee fighting.
The higher your pet's magery, the more powerful its spells will be as well as having better buffs (a pet with 100.0 will be able to give itself +11 stats whenever it blesses itself). Magery will raise when it casts spell of appropriate difficulty for the pet's skill level (ie. lightning at around 50 magery, ebolts at around 65 magery, etc.). To achieve grandmaster from the upper 90's, it will need to cast 7th circle spells such as flamestrike or mass dispel.
To force a pet to mass dispel, you will need to be unguilded and be under a Trammel ruleset. Summon an earth elemental and have both summon and your pet guard you. Have the two fight each other. Neither will be able to inflict damage on each other, due to the Trammel ruleset, but will still be able to attack each other because of the guard command (if you are guilded or are in Felucca, the pet will simply kill the summon). The pet will be able to gain magery, even if the summon resists the mass dispel. The summon will only be dispelled if the pet casts mass dispel. This sort of training is best done once the pet has at least 90 magery, due to the high reg cost.
The higher your pet's evaluate intelligence, the more powerful its spells will be. This skill raises passively whenever your pet casts a spell.
The higher your pet's meditation, the faster its mana will regenerate. This skill will raise passively any time your pet is not at full mana. The higher the pet's meditation skill, the less full the pet's mana will need to be to gain at a decent level.
As the pet's skills increase, so will their stats. Magery, eval int, and meditation will all raise intelligence. Wrestling will raise strength and a little dex. Anatomy will also raise int as well as a little strength and dexterity. A pet's strength will always equal the amount of hit points it has. The same is not always true for dexterity and stamina or intelligence and mana. Some pets will have 10 intelligence, but "---" or 0 mana. As their intelligence raises, so will their mana, and they will become closer and closer to equal.
Pets can only be trained up to 125 in any given stat. If the pet naturally has over 125 in any given stat, it will not raise any higher.