Below are some common reasons the app may be crashing and solutions for them. Please submit a ticket with specifics of what you were doing when the app crashes (include a screenshot if possible) if these don't resolve the issue.
The app crashes immediately when I attempt to open it (Android)
Have you recently gotten a new phone or restored from a backup for some reason? If so, this is likely related to the app migration process. Try going to Settings app > Apps > Precise Petcare > Storage and then use the "Clear data" option.
The app crashes when I am typing notes on journals (Android/Samsung)
This may be an issue with the Samsung Keyboard. Try the steps found at https://r2.community.samsung.com/t5/Galaxy-A/Keyboard-Freeze-Glitch/td-p/6641767. If that doesn't work disable Grammarly for the app using the steps found at https://support.grammarly.com/hc/en-us/articles/5009674207245-How-to-turn-off-Grammarly-for-Samsung-Keyboard-.