My bitch has just eaten up and then went to do her buisness, she did a normal poo then she went and done another one, only this time it was not right at all.
The only way to describe it is it really does look loke a piece of liver, on further investigation it is softer than liver but very thick and slimey like liver.
Can you help? I have never seen anything like it.
Oh and don't want to sound disgusting but it did not smell like poo.

Is she the type of dog that picks things up and eats thing id ring the vet and ask for advise and see if they say to take her down

It sound like she could have colitis.  If it is, it's not unusual, but she needs to see your vet.

She ate up this morning and then went and done a poo, it was much better than last nights, just the odd bit of slime.
How do they get colitas? is it dangerous?

Colitis is inflammation of the mucus membrane in the rectum and colon.  What causes one dog to have it rather than another is not known but many flare ups are caused by certain foods or stress related.  The cells in the bowel, and the mouth, replace themselves faster than any others in the body so it is always worth resting the bowel with no solid food at all for 24 hours to allow the mucus membrane to recoat itself if that fails you will probably need treatment to reduce the inflammation, usually with steroids, as a bad attack can lead to haemorrhage, in acute cases perhaps perforation and after many years it is possible it may give rise to carcinoma of the colon although the dogs life span is such that that is not very common at all.
If things don't settle down in 24 hours you also need to consider infection.
If you dog does have chronic colitis I would not worry too much, well managed there is not reason why it should not live to 15 as mine did :)

My ESS bitch is prone to attacks of colitis if she gets too much wheat........  Even 2 slices of bread is enough to set her off :(