Age at cancer diagnosis (range, mean, and median) by breed.

(DOCX)</p

Age distribution at cancer diagnosis by breed for breeds represented by ≥10 dogs.

Age distribution at cancer diagnosis by breed for breeds represented by ≥10 dogs.</p

Weight distribution of the study population for 2,551 dogs that had a documented weight.

Weight distribution of the study population for 2,551 dogs that had a documented weight.</p

Median age at cancer diagnosis in 1,495 purebred dogs: Breed-based data versus prediction from weight-based model for breeds that had a documented weight for ≥10 dogs.

Median age at cancer diagnosis in 1,495 purebred dogs: Breed-based data versus prediction from weight-based model for breeds that had a documented weight for ≥10 dogs.</p

Cancer types represented in the study population of 3,452 dogs.

Cancer types represented in the study population of 3,452 dogs.</p

Cancer types represented in the study population of 3,452 dogs, and the percent contributions of the three cohorts that provided data for the current study.

(DOCX)</p

Demographics/Characteristics of the study population of cancer-diagnosed dogs.

Demographics/Characteristics of the study population of cancer-diagnosed dogs.</p

Age distribution at cancer diagnosis for cancer types represented by ≥10 dogs.

Age distribution at cancer diagnosis for cancer types represented by ≥10 dogs.</p

Demographics/Characteristics of the study population of 3,452 client-owned cancer-diagnosed dogs, and the percent contributions of the three cohorts that provided data for the current study.

(DOCX)</p

Age distribution at cancer diagnosis for mixed-breed or other vs. purebred dogs.

Age distribution at cancer diagnosis for mixed-breed or other vs. purebred dogs.</p