Table 3.

Breathing scores^a

Breathing score response	Observer	Method of induction, No. of dogs (%)
		Initial P	Initial M	Second P + S	Second P + D	Second M + S	Second M + D
0	DRD	1 (5.2)	1 (5)	0 (0)	0 (0)	0 (0)	0 (0)
	MBB	0 (0)	3 (16.7)	0 (0)	0 (0)	0 (0)	0 (0)
1	DRD	8 (42.1)	11 (55)	3 (33.3)	0 (0)	5 (50)	0 (0)
	MBB	12 (60)	12 (66.7)	4 (40)	0 (0)	4 (44.4)	0 (0)
2	DRD	8 (42.1)	5 (25)	3 (33.3)	2 (20)	3 (30)	4 (40)
	MBB	8 (40)	2 (11.1)	3 (30)	2 (20)	5 (55.5)	3 (33.3)
3	DRD	2 (10.5)	2 (10)	3 (33.3)	8 (80)	2 (20)	6 (60)
	MBB	0 (0)	1 (5.6)	3 (30)	8 (80)	0 (0)	6 (66.6)
Total responses	DRD	19	20	9	10	10	10
	MBB	20	18	10	10	9	9
P value		.159		.966

D, doxapram; M, methohexital; P, propofol; S, saline.

^aAssigned by direct observers (DRD and MBB) during initial and second evaluations of group P and group M. Each number represents the frequency of dogs (%)in which the depth of breathing was scored. Breathing was scored as 0 = no spontaneous respirations, 1 = shallow respiration, slow respiratory rate, weak attempt, 2 = moderate respiration rate and attempt, and 3 = deep respiration, normal respiratory rate, and strong attempt. The first observer (DRD) was not available for evaluation of 1 dog in the P group, yielding 39 dogs in total that were evaluated. The second observer (MBB) was absent for evaluation of 2 dogs in the M group, yielding 38 dogs in total that were evaluated.