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Trainer Comparison

Statistics by Year:
Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 0 0 0 0 0 0 0% 0% $0 $0 $0 0 0
Donald G. Horrell 4 9 2.25 0 1 2 0% 33.33% $11,190 $1,243 $2,798 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 3 15 5 3 3 2 20% 53.33% $36,172 $2,411 $12,057 0 0
Donald G. Horrell 2 8 4 0 1 2 0% 37.5% $6,605 $826 $3,303 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 10 48 4.8 2 4 10 4.17% 33.33% $91,967 $1,916 $9,197 0 0
Donald G. Horrell 1 2 2 0 0 0 0% 0% $705 $353 $705 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 12 48 4 3 4 7 6.25% 29.17% $97,477 $2,031 $8,123 0 0
Donald G. Horrell 1 1 1 0 0 0 0% 0% $75 $75 $75 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 12 52 4.33 8 6 9 15.38% 44.23% $174,039 $3,347 $14,503 0 0
Donald G. Horrell 1 1 1 0 0 0 0% 0% $105 $105 $105 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 8 33 4.13 3 9 7 9.09% 57.58% $108,594 $3,291 $13,574 0 0
Donald G. Horrell 3 8 2.67 0 0 1 0% 12.5% $2,223 $278 $741 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 8 36 4.5 4 7 1 11.11% 33.33% $71,485 $1,986 $8,936 0 0
Donald G. Horrell 5 20 4 0 0 1 0% 5% $4,875 $244 $975 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 13 50 3.85 3 6 7 6% 32% $61,790 $1,236 $4,753 0 0
Donald G. Horrell 6 15 2.5 1 0 2 6.67% 20% $5,278 $352 $880 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 13 31 2.38 0 2 6 0% 25.81% $19,232 $620 $1,479 0 0
Donald G. Horrell 4 18 4.5 4 0 4 22.22% 44.44% $12,494 $694 $3,124 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 8 63 7.88 4 9 17 6.35% 47.62% $114,264 $1,814 $14,283 0 0
Donald G. Horrell 3 15 5 2 1 1 13.33% 26.67% $16,118 $1,075 $5,373 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 14 47 3.36 2 3 2 4.26% 14.89% $45,550 $969 $3,254 0 0
Donald G. Horrell 4 23 5.75 2 2 3 8.7% 30.43% $20,220 $879 $5,055 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 11 46 4.18 3 4 7 6.52% 30.43% $55,796 $1,213 $5,072 0 0
Donald G. Horrell 7 41 5.86 5 6 5 12.2% 39.02% $43,924 $1,071 $6,275 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 2 9 4.5 1 0 0 11.11% 11.11% $5,925 $658 $2,963 0 0
Donald G. Horrell 9 39 4.33 5 4 2 12.82% 28.21% $38,867 $997 $4,319 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 16 39 2.44 3 7 6 7.69% 41.03% $34,662 $889 $2,166 0 0
Donald G. Horrell 11 75 6.82 8 4 11 10.67% 30.67% $63,351 $845 $5,759 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 34 104 3.06 7 9 6 6.73% 21.15% $88,549 $851 $2,604 0 0
Donald G. Horrell 11 82 7.45 9 8 13 10.98% 36.59% $78,027 $952 $7,093 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 35 183 5.23 19 21 19 10.38% 32.24% $224,290 $1,226 $6,408 0 0
Donald G. Horrell 17 89 5.24 6 10 10 6.74% 29.21% $61,959 $696 $3,645 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 32 144 4.5 16 13 18 11.11% 32.64% $148,302 $1,030 $4,634 0 0
Donald G. Horrell 20 113 5.65 10 20 14 8.85% 38.94% $112,777 $998 $5,639 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 26 121 4.65 10 13 17 8.26% 33.06% $104,460 $863 $4,018 0 0
Donald G. Horrell 23 91 3.96 18 7 10 19.78% 38.46% $157,021 $1,726 $6,827 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 29 187 6.45 24 19 27 12.83% 37.43% $232,867 $1,245 $8,030 0 0
Donald G. Horrell 18 62 3.44 6 11 4 9.68% 33.87% $95,119 $1,534 $5,284 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 38 217 5.71 32 32 23 14.75% 40.09% $324,413 $1,495 $8,537 0 0
Donald G. Horrell 17 68 4 5 5 7 7.35% 25% $67,531 $993 $3,972 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 31 159 5.13 30 24 22 18.87% 47.8% $270,410 $1,701 $8,723 0 0
Donald G. Horrell 22 87 3.95 9 10 7 10.34% 29.89% $82,999 $954 $3,773 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 22 83 3.77 16 16 9 19.28% 49.4% $104,727 $1,262 $4,760 0 0
Donald G. Horrell 28 114 4.07 8 11 8 7.02% 23.68% $108,426 $951 $3,872 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 20 98 4.9 12 11 11 12.24% 34.69% $84,430 $862 $4,222 0 0
Donald G. Horrell 25 113 4.52 5 11 8 4.42% 21.24% $72,532 $642 $2,901 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 2 4 2 0 1 0 0% 25% $2,055 $514 $1,028 0 0
Donald G. Horrell 32 129 4.03 9 6 13 6.98% 21.71% $62,549 $485 $1,955 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 0 0 0 0 0 0 0% 0% $0 $0 $0 0 0
Donald G. Horrell 62 228 3.68 22 23 24 9.65% 30.26% $93,381 $410 $1,506 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 0 0 0 0 0 0 0% 0% $0 $0 $0 0 0
Donald G. Horrell 53 258 4.87 40 32 35 15.5% 41.47% $114,978 $446 $2,169 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 0 0 0 0 0 0 0% 0% $0 $0 $0 0 0
Donald G. Horrell 44 161 3.66 20 21 14 12.42% 34.16% $76,007 $472 $1,727 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 0 0 0 0 0 0 0% 0% $0 $0 $0 0 0
Donald G. Horrell 47 225 4.79 20 26 33 8.89% 35.11% $86,677 $385 $1,844 0 0

Name Starters Starts Starts/
Starter 		1st 2nd 3rd Win % % 1st, 2nd or 3rd Earned Avg Earnings per Start Avg Earnings Per Starter Graded Stakes Win All Black-Type Win
2025 National Trainer Avg. 4 13.53% 40.55% $5,513 $22,031
Pamela A. Arnold 7 26 3.71 2 3 1 7.69% 23.08% $10,536 $405 $1,505 0 0
Donald G. Horrell 45 254 5.64 24 26 27 9.45% 30.31% $79,231 $312 $1,761 0 0