Intimacy Characteristics
Classification Point Range
Very shy Less than 100 Ready to abandon its owner
Shy 100–249 Uses unhappy emotes such as

and /wah
Neutral 250–749 Uses friendly emotes such as

and

Cordial 750–909 Uses affectionate emotes such as

and

Loyal 910–1000 Talks often and uses affectionate emotes
A pet is given a random number of intimacy points between 250–399 when it's first hatched. The higher level the pet is, the less intimacy it will begin with. Feeding a pet increases its intimacy relative to its level and hunger; higher level pets get less intimacy per feeding, and vice versa. A pet's hunger level is classified using the following terms: 'very hungry', 'hungry', 'neutral', 'satisfied', and 'stuffed'.
A pet’s intimacy decreases by 15 points when its owner dies. Intimacy doesn't decrease when a pet is returned to its egg.
this is as far as i know pretty accurate, seems to hold true for all the pets i've had XD *collects pets*