What are the possible causes of liver cysts? When are they dangerous?

Go and see you doctor .

A bakers cyst is caused when excess joint fluid is pushed into one of the small sacs of tissue behind the knee. When this sac fills with fluid and bulges out, it is called a cyst. The excess fluid is usually caused by conditions such as arthritis that irritate the knee. It may also be caused by an injury.

About the same volume you would get from 2.5 bottles of wine.

If it is really a cyst, and not something like a blood clot or aneurysm, the doctor may decide on

cortisone
drainage with a needle
ice and physiotherapy

It is important to discover the base cause of the cyst, which could be

torn cartilege
ligament damage
arthritis

so that can be treated too. Please don't resort to quack treatments and herbal remedies, they won't work. See a doctor.
.

If you wear contact this could be caused from to changing them or not cleaning them properly

Yes, propylene Glycol or antifreeze is very dangerous for dogs. It tastes kind of sweet and they may drink it. According to PetMD: " less than three ounces (or 88 ml) of antifreeze is sufficient to poison a medium-sized dog. Antifreeze poisoning affects the brain, liver, and kidneys." This is why it can also cause seizures.