Table 2. Summary of the total dogs sampled, recruited and with follow-up sample, according to the trial intervention arm to which the dogs were subsequently allocated.

Intervention arm	Dogs initially sampled for potential recruitment	Seronegative dogs recruited (proportion of sampled)	Negative dogs with follow-up sample (proportion of recruits)
Control	1,575	961 (0.610)	455 (0.473)
Pheromone	1,702	994 (0.584)	480 (0.483)
Collar	1,641	1,016 (0.619)	519 (0.411)
Total	4,918	2,971 (0.604)	1,454 (0.489)