"Growing bloodlust" among teenage gangs has led to attacks with airguns and packs of dogs on deer in urban areas.
This roe deer was hunted and killed by youths in Glasgow
The Scottish Society for the Prevention of Cruelty to Animals (SSPCA) said there were 14 reported incidents in the Greater Glasgow area last year.
In one case, a roe deer was chased by teenagers and dogs in Knightswood. It was shot and then kicked to death.
Doreen Graham, of the SSPCA, said: "This isn't about sport or gambling. This is a growing bloodlust."
The SSPCA said the public who witness attacks on deer are often too scared to call police because of the brutality involved.
The majority of cases are said to take place in the Knightswood and Millerston areas of Glasgow.
In one incident in Millerston, a man awoke to find the body of a young deer hanging from his washing line. The animal's throat had been cut.
Four deer were killed in the Millerston area last year.
Ms Graham said: "We are receiving regular calls concerning the illegal coursing of deer across the west coast in and around Glasgow.
"More and more, the perpetrators seem to be in their late-teens, which is a deeply worrying trend."
She added: "Unfortunately, trying to catch these people is very, very difficult. We have to find them in the act of killing the deer, and their activities take place in the early hours of the morning."
The SSPCA and police warned those capable of such violence are also capable of turning their brutality on humans.
Do you have pictures of gangs targeting deer in your area? Send them to the BBC news website Click here to send an email.
If you want to send your picture from your mobile phone, email them to email@example.com. You can send them from any network or phone. Please send the large full size images (usually 640x480 pixels) taken by the mobiles otherwise they are too small to publish.
If you submit an image, you do so in accordance with the BBC's Terms and Conditions.
In contributing to BBC News Online you agree to grant us a royalty-free, non-exclusive licence to publish and otherwise use the material in any way that we want, and in any media. (See the Terms and Conditions for the full terms of our rights.)
It's important to note, however, that you still own the copyright to everything you contribute to BBC News Online. This means you are perfectly free to take what you have produced and re-publish it somewhere else. Please note that if your image is accepted, we will publish your name alongside it on the BBC News website. The BBC cannot guarantee that all pictures will be published and we reserve the right to edit your comments.