A resident reported it to the RSPCA, saying it had "lost weight" in recent weeks and not moved "for days".
Snowy the cat was found with painful, untreated scabs and sores across his body.
Derrick Daniel Dawkins has also been banned from keeping any animal for 10 years.
The RSPCA and police have launched a joint appeal for information after the horse was subjected to a "vicious attack".
Two dogs were left near a busy Somerset road just days before another one was found in the same spot.
The RSPCA is investigating after three male guinea pigs were dumped outside a shop with a note saying their mummy couldn't look after them
The man's actions have been described as "unthinkable and despicable" by the RSPCA.
Animal welfare charity the RSPCA is appealing for information so they can find the person responsible.
Two-year-old Hector recently spent his second Christmas in the Devon shelter.
The animal welfare charity took nearly 4000 calls from the South West to its animal cruelty hotline last December.