Dog Law in England and Wales
There have been a number of changes in the law relating to dogs. A very good summary can be found on the Dogs Trust website.
Dog Law in Northern Ireland
https://www.dogstrust.org.uk/help-advice/factsheets-downloads/doglawnorthernirelandfeb14.pdf
Dog Law in Scotland
https://www.dogstrust.org.uk/help-advice/factsheets-downloads/doglawscotlandfeb14.pdf