Paul Flowers, an EDL Northampton division admin, was sentenced to 16 weeks in prison and banned from keeping animals after admitting cruelty to seven ponies seized by the RSPCA.
Welfare officers found the starving animals in a field in Blisworth.
Some had ground down their tooth enamel trying to get the last blades of grass from the field in Station Road. Because the couple, who are both unemployed, refused to hand ownership of the animals to the charity, the ponies had to be kept at a boarding house which cost the RSPCA £18,000 in fees.
The ponies have now been rehomed.