Table 1. The effect of washing step on the qualitative analysis of elements in dog’s hairs.

	Ca	Cu	Fe	K	Mg	Na	P	Se	Zn
2 step (μg/g)	1,382,142.5	351.2	310.4	1,146	540.8	2,478.6	866.6	56.3	1,715.2
3 step (μg/g)	1,311,745.1	373.9	254.9	436.9	543.3	917.3	673.6	56.8	1,894.1
Difference (%)	–5.1	6.4	–17.9	–61.9	5	–63	–22.3	9	10.4
Correlation	0.9	0.9	0.6	0.4	0.9	0.4	0.7	0.9	0.6
t-test	0.745	0.158	0.242	0.012	0.98	0.002	0.096	0.952	0.026

Values are mean.