Weight Trends and Litter Box Usage Patterns for the Morache Clowder

Last Updated July 11, 2025

Author:

Mathias MH Morache | Software Developer & Cat Enthusiast


Overview

This report analyzes weight trends and litter box usage patterns for each of my four cats. The data was collected from a Litter-Robot 4 automatic litter box starting November 5th, 2024.

(a) Gilbert (Biralo)
(b) Speck (Nunu)
(c) Catness
(d) Frankie
Figure 1

Methodology and Data Cleaning

The following considerations should be noted:

  • Scale Precision: The precision and consistency of the Litter-Robot’s scale is unknown. However, I did not observe any glaringly inaccurate readings collected under normal circumstances.
  • Cat Identification: Recordings are attributed to specific cats based on weight ranges, assuming each cat maintains a distinct weight profile. Gilbert and Frankie are the closest to overlapping in ranges, but this did not appear to happen. Although the Litter-Robot uses an “advanced cluster algorithm” to identify cats, this information is not exported.
  • Outlier Removal: Extreme weight outliers, due to erroneously recorded events such as litter refilling and maintenance, have been removed from the dataset.
  • Data Consolidation: Consecutive weight recordings within 15-minute intervals have been averaged to reduce noise and simplify analysis.

Cat Profiles

All of my cats share these characteristics:

  • Indoor: They live exclusively indoors.
  • Diet: Their diet consists primarily of wet food (Friskies 5.5 oz cans), typically consuming 4-6 cans per day, supplemented with dry treats (Temptations, Friskies), and bonito flakes (鰹節, katsuobushi, AKA skipjack tuna).
  • Sterilization: All cats are spayed or neutered.
  • Birthdate: With the exception of Gilbert, all birthdates are approximate, based on the best guess of the intial veterinarian who treated the cat after adoption.


Cat Profiles
Cat Age Sex Health_Issues Medication
Catness 5 Male None None
Frankie 4 Male None None
Gilbert 12 Male Hyperthyroid, vomiting (chronic) Methimazole, 3.75 mg
Speck 8 Female tooth decay, diarrhea (chronic) None


Summary Statistics

Key statistics for each cat’s weight and litter box usage are summarized in the following tables and plots.

Weight Summary Statistics per Cat
Cat Min Max Avg Med SD Skew Kurt
Catness 9.5 10.9 10.3 10.4 0.36 -0.23 2.06
Frankie 11.0 12.1 11.6 11.6 0.33 -0.29 1.98
Gilbert 12.2 13.0 12.5 12.5 0.21 0.41 2.36
Speck 7.5 8.9 8.0 8.0 0.28 0.29 3.24


Litter Box Visit Frequency per Cat
Cat Total_Visits Weekly_Visits
Catness 763 21.8
Frankie 634 18.1
Gilbert 752 21.5
Speck 801 22.9



Weight Statistics

The following plots provide a more detailed look into weight trends for each individual cat. The standard error of the regression line is shaded in gray, representing a 95% confidence interval.