Splenic ultrasound measurements and splenic volume calculation with both standard (VOLStandard) and modified (VOLModified) formulas, as previously published by Navas et al. [27], for each time point (T0 = baseline prior to acepromazine administration, T1 = 1 h after acepromazine administration, T2 = 12 h after acepromazine administration) presented as median (Q1, Q3). p-values reflect results from one-way repeated measures ANOVA, * denotes statistical significance. Where applicable, values within a row that have different superscripts (a, b) were significantly different on Tukey’s HSD post hoc test.