The reason for that is that Masterings are more chonkier than porings so they need moar food.
Jk, it's already answered in the bug threads
https://forums.warpp...l/#entry2943133
Evolved pets having a much slower intimacy progression is intended.
The trade-off here is that it will also be way harder to lose your pet unintentionally (frequent owner deaths or starving) and they now take a longer time before they get hungry (which also indirectly slows down intimacy progression lol)
And yes, pets lose a lot of intimacy points for owner's deaths.
Sidenote: porings gain intimacy at more than 2x the average rate that other pets do : P
Edited by ninJedi, 30 January 2020 - 05:23 PM.