My memory is awful. Seriously. I will try to remember that I have done something and think I have not realizing that what I remember was DAYS ago. Now for some things that can fly under the radar, not so much with taking care of my animals. Sure, they let me know if the food bowl is empty, some fairly vocal about it! But they need consistency, reliability, and deliberate care.
So I keep track. Of everything. If they have been fed, when I cleaned their bedding or cage, disinfecting their bowls, flea meds, allergy meds, when we have gone for a walk and how far (Jager has a weight problem, plus she loves it).
Here is how I keep track in my Bullet Journal: