An animal welfare charity is appealing for information to help it break up "barbaric and cruel" dog fighting and badger baiting rings.
The Scottish SPCA said it needs help from the public because of the secretive nature of the crimes. Many of those involved do not take their dogs out in public and treat the animals' injuries at home, rather than taking them to the vet.
The charity said it has received intelligence that dog fighting rings are operating in Grampian, Glasgow and in and around the Edinburgh area.
Meanwhile, badger baiting is rife throughout the Central belt including the Lothians, Borders, the Strathclyde police area, Ayrshire and Dumfries and Galloway, it said.
The charity has launched a nationwide appeal for information about the crimes.
Chief Superintendent Mike Flynn said: "Many people will be shocked that these sickening activities are still going on in Scotland. But animals are still being forced to fight, often to the death, and the pain and suffering they endure is horrendous.
"Our Special Investigations Unit gathers intelligence on all forms of animal fighting and over the last 18 months our investigations have led to criminal convictions and prison sentences. This sends a strong message that we're determined to pursue those involved in these crimes, which are barbaric, cruel beyond belief and have no place in modern society."
He said that the crimes are taking place throughout the country.
Animal fighting is a criminal offence under the Animal Health and Welfare (Scotland) Act 2006 and those caught face up to 12 months in prison, a £20,000 fine or both.
The Scottish SPCA said that in September 2011, Aberdeenshire brothers David and Colin Reid were jailed at Banff Sheriff Court for dog fighting following an investigation by the charity. David Reid, then 22, was jailed for six months while Colin Reid, then 24, was jailed for four months. Both men were also banned from keeping dogs for five years.