The RSPCA says it is called out 100 times a month across Lincolnshire, Rutland and East Anglia.

Recent cases include two donkeys being staved to death and a pony whose skin peeled off after eating poisonous plants.

Now the charity has begun a campaign called Horse Sense to try to educate owners about keeping animals.

Sadly, there seems to be widespread ignorance of the basic needs of horses

John Atter, RSPCA manager

Leaflets detailing an Equine Commitment Charter are being made available to owners.

It includes a checklist of the needs of horses and related animals.

John Atter, regional manager for the charity, said: "It can cost about £70,000 to look after a horse properly for the duration of its life.

"It's a major financial commitment - yet we still see many people taking responsibility for equines without having the time, money or knowledge to provide them with the care they need.

"Routine upkeep such as farriery and worming are often overlooked, and our inspectors see malnourished animals all too regularly.

"It is a situation that gives us serious cause for concern.

"Sadly, there seems to be widespread ignorance of the basic needs of horses.

"The consequences of this for the animals involved are misery, suffering and sometimes even death."