It took an hour and a half for a jury to find Donald and Terri Harwood guilty on all nine counts of inhumane treatment to animals.
During the trial, prosecutors said the evidence shows the nine horses being looked at in the case were not being fed, they were in poor condition and had no vet treatment.
Defense attorneys said the Harwoods care about horses and they did not intend to hurt them. They say the horses had an illness.
In January, the Pennington County Sheriff's Office impounded 69 horses from their property on Radar Hill road after allegations of neglect.
The Harwoods owned approximately 30 of the animals and they were boarding the rest.
A sentencing date has not been set. The Harwoods could face 10 years in prison and a $20,000 fine.