Do dogs suffer from these problems?

I'm not a medical expert on dogs nor do I have any vetrinary training, but I think dogs just get excited when someone strange enters their turf. I do think, however, that a dog who lives in a stressful situation such as discord or fighting in a home with bad karma has his/her immune system weakened by the stress just like a human does. I think dogs are very in tuned with their environment the same as children are. A loving, peaceful environment promotes good behavior and good health and a stressful, harsh environment promotes bad behavior and has adverse reactions on the body.

My dogs have always been exciteable which is neither good or bad. It's just the way dogs are.

Dogs do indeed have strokes. However, all of them that I have seen and treated over the years have been related to age, rather than stress. Obviously, stress in any mammalian species results in stimulation of the adrenal cortex, causing the release of steroids which temporarily supress immune system function. I strongly disagree that a loving environment results in good behavior. Manners are learned by dogs just as they are by children. A spoiled brat is a spoiled brat, regardless of the number of legs it possesses.

Thanks for the replies.

I guess I'm wondering why more dogs don't die from heart problems versus cancer, etc. More home owners have dogs now for "guard dog duty" reasons and they get very worked up to the point of having what appears to be an apoplectic fit. This doesn't seem to be the case.

Congestive heart failure is common, especially in small breeds. "Heart attacks". better known as myocardial infarctions, are essentially unheard of in dogs and other domestic animals because, while primates' coronary arteries do not connect with each other, there is collateral circulation in other animals that allows continuing blood flow if an occlusion occurs in one of their coronary arteries. Make more sense now?

You bet! Very interesting info. Thanks again....