Table 1.

Signalment data for control and cancer groups. Although both included a wide range in age, the dogs in the control group were significantly younger (P < .001), and there were more sexually intact dogs (P < .001) than in the test group which reflects a selection bias based on targeting at‐risk breeds

	Control	Cancer
N	156	253
Median age in years (range)	6.5 (0.4–10.9)	9.5 (1.8–16)
Sex (n)	F(35), FS(47), M(42), MN(32)	F(8), FS(104), M(8), MN(133)
Breed (n)		Giant (5)
	Large (156)	Large (137)
	[GSD n = 58]	[Lab/mix n = 47]
	[Golden Retriever n = 97]	[Golden Ret/mix n = 29]
		Medium (31)
		Small (61)
		[Beagle n = 13]
		Unknown (19)