The size of a dogs heart will vary greatly with the size of the dog.
60-120 times per minute, depending on the size, breed and level of fitness. Small dogs have a faster heart rate than large dogs.
About 180 for puppies & 60 for grown dogs
Knee & hip problems. One of mine has a large heart murmur, both dogs require medication for their problems.
The same as your heart does for you: pumps blood.
Yes. Dogs are mammals, and a 4 chambered heart is physical feature of mammals.
no.
all dogs have the same size heart, that is why larger dogs live shorter than smaller dogs
No, heartworms gather nutrients from the blood streaming by them. In fact, heartworms don't actually live in the heart of dogs - they live in the large pulmonary arteries in the lungs but swim into the heart after the dog dies.
Dogs have the largest hearts compared to the size of the rest of their bodies. This applies to all breeds of dogs.
enlarged heart
large vessels on top of the heart are the veins.
Yes, heart murmurs in dogs are hereditary. Generally any heart problems that the mother or the father of a dog has is usually passed down to the puppies.