We recommend using the Thunderstore Mod Manager or an alternative for installing mods
This simple mod will add information to the hover text of tamed animals.
This mod is fairly simple and forward. There is one thing to know, for some reason, the game reports that a pregnancy for Lox lasts 120 seconds, but in reality it lasts 150 seconds. This means that a full pregnancy for a Lox will be completed at 125%.
The same issue exists for boars, in this case the pregnancy reported is 60 seconds, but actually is 85 seconds.
Support for custom animals have kindly been provided by Virtualbjorn.
Github code here.