YOBS believed to be only 12 years old kicked a piglet to death.
Police are now hunting for the culprits, who they believe to be as young as 12.
The gruesome attack happened at around 6pm last Friday in a freehold off Boundary Lane, Normanton.
A dog walker spotted two boys “violently kicking” at the piglet, which belonged to Roger Owen, of The Crescent.
The 13-week-old baby pig called Matilda was one of four piglets at the site.
Father-of-two Mr Owen, 41, said: “It was the runt of the litter and the only one we named.
“The whole family is very upset and I cannot believe someone could commit such an act.
“I know children can get up to mischief , but to do this makes me feel numb and it has been emotional.”
PC Steve Day of Normanton neighbourhood police team (NPT) said two boys ran towards Wakefield Road after being disturbed by a dog walker.
He said they were described as being aged between 12 and 14 years old, wearing jeans tucked into their wellies and light-coloured T-shirts.
PC Day said: “This appeared to be a prolonged and sustained attack, the level of injury caused is such that one of the piglets died from its injuries.”
Mr Owen says the piglets had previously been shot with an air rifle and horses in a nearby freehold had been whipped by youths.
He said he was thinking about keeping sheep on the land, but the latest incident had put him off keeping animals.
Anyone with any information should contact the police on 101, quoting crime number 13120110473.
Or ring Crimestoppers, anonymously, on 0800 555111.