Er, the maximum term of imprisonment in the UK is now 51 weeks - it's gone up from six months. Plus for some offences you can both be fined and put in prison for the same offence.
Section 32: "A person guilty of an offence under any of sections 4, 5, 6(1) and (2), 7 and 8 shall be liable on summary conviction to—
(a)imprisonment for a term not exceeding 51 weeks, or
(b)a fine not exceeding £20,000,
or to both."
Sections 4, 5, 6, 7, and 8 of the Act cover such things as unnecessary suffering, mutilation, docking dogs' tails for cosmetic reasons, poisoning, and fighting. There's a similar Act in Scotland.
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