Gastric dilatation volvulus

My dogs abdomen is distended and he's acting very restless
It’s a scary situation when your dog looks like he has a bloated tummy, but he’s really experiencing a life-threatening medical emergency. Gastric dilatation volvulus or GDV is also called bloat, but it’s more than just a bit of air in the stomach. Its other name – gastric torsion – describes how, once inflated with air, the stomach can also twist around itself and cut off blood supply to other major organs. The body then goes into shock and the condition becomes life-threatening.
Eclampsia in pets

My dog/cat recently had puppies/kittens and is starting to show strange twitches and spasms
What is eclampsia?
Eclampsia is a life-threatening condition in dogs and cats that have recently had a litter of puppies or kittens. It has been seen in pets that are pregnant or giving birth, but more commonly occurs one to four weeks after giving birth. It is a medical emergency caused by a sudden drop in blood calcium levels, usually due to calcium loss during pregnancy and nursing.
Dilated cardiomyopathy (DCM) in dogs and cats

My pet tires quickly when playing or exercising and sometimes has a soft cough like trying to clear their throat
What is dilated cardiomyopathy?
Cardiomyopathy is a disease condition of the heart muscle that inhibits its ability to function properly. In the case of dilated cardiomyopathy (DCM), the heart muscle is stretched and the muscle is thin and flabby, affecting its pumping ability. Dilated cardiomyopathy can affect both pets and people.
The heart is designed as a pump where each contraction pushes blood from the lungs to the rest of the body and back again. This allows the oxygen we breathe in to be absorbed in the blood and distributed to where it is needed. When the pump itself is affected, the distribution and flow of blood is compromised. In DCM, the bottom chambers of the heart, which are the power house for the pumping action, are dilated and thin, and unable to properly expel the blood presented to them from the lungs and body. This leads to a backup behind the heart. Depending on which side of the heart is more severely affected, this usually ends up with fluid and blood buildup in the lungs. In DCM, it is usually all four chambers of the heart that are stretched and affected, not just one side. This stretching of the muscle also affects the electrical conduction of the heart and its ability to pump at a normal rhythm.