There are several activities you can do to improve your relationship with your pet, these can be found in the main menu > select your pet > access the Relationship tab > check the Activities tab. But depending on your pet, some activities may not be available:
Walking: Pets like dogs should be taken for a walk from time to time.
Bathing: increases Relations and Hygiene.
Treat: Giving them treats after a bath or walk increases their affection.
Spending time: Spending time and playing together increases relationships.
You can also take your pet to the vet, this is something you have to do, especially if your pet starts to act strangely, in order to take care of their health. The shortest lifespan is for fish and hamsters, while the longest is for birds.
If you want a perfect relationship with your pet, you will have to repeat all the available activities, to fill the relationship bar completely.
This is all you need to know about how to increase the relationship with your pets in BitLife so now that we're done, we hope we've been as helpful as possible and we hope you can get a lot of use out of this article to improve your relationship with your pets.