Urm, Use the 1991 Dangerous Dog Act.
If a dog or indeed any animal under your control injures a person or animal or damages property, the owner or person responsible may be liable for damages. This would be a civil claim and not necessarily a criminal offence.
2. If a dog is dangerously out of control in a public place, or a private place where it is not permitted to be, the owner; and if different, the person for the time being in charge of the dog, is guilty of an offence.
"A dog shall be regarded as dangerously out of control on any occasion on which there are grounds for reasonable apprehension that it will injure any person, whether or not it actually does so."
so i fly on a school field where dogs aint ment to be so i have a claim even if it chases the kite as it has intent of getting it