ASK the VET.
Q The vet says my dog is suffering from a heart problem and I am worried that she might be in pain. Can dogs get angina? Brian replies: That's a very good question. The short answer is that no evidence has been collected on how dogs and cats behave with heart disease.
The longer answer is that dogs and cats have a different type of cardiac circulation to people.
Human coronary circulation is a series of cul-de-sacs supplying a series of cells. If a cul-de-sac gets blocked it leads to cell death, pain and a heart attack.
Dog hearts have a circular system. If one end gets blocked, blood can get in via the other. So while dogs and cats do get heart disease, they don't suffer heart attacks and feel the pain of them in the same way as people.