They’re not visible. It's not like any worms that you could see in the poop or the stool, sometimes when dogs do have internal intestinal parasites, as this is one that lives in the bloodstream. The only way to really visualize them is with the use of imaging like x-rays or ultrasound. So they're not visible on just examination, you need other special tools to help you take a look at them.

It’s hard to say in pets whether it is painful. I don't think the worm as it travels itself is necessarily painful, but as they develop these symptoms, discomfort and pain follows. The inflammation that the worm causes can lead to pain as well inside the body.

The signs can vary pretty significantly. It varies from mild to moderate to severe to worst cases, even death. Some dogs go asymptomatic at the beginning, meaning they're not showing any clinical signs or symptoms, which solely could progress into a cough or just more exercise intolerance, getting tired easily. As it progresses into the more moderate, severe signs, you see breathing issues, bulging rib cage, trying to catch their breath, a persistent potential cough. In some dogs, we can hear a heart murmur because remember this is a heartworm, it goes through the blood and lives inside the heart. So it affects the heart which can back up and eventually lead to fluid in the abdomen, fluid in the chest, and it can lead to enlarged hearts and enlarged livers as well. So as far as clinical signs, exercise intolerance, coughing, panting, difficulty breathing, losing weight, not eating as much. These are some typical signs you could watch for.

I do believe so, yes.

Fleas and ticks will most certainly not resolve on their own. Unfortunately, despite what we want, fleas and ticks are parasites and they do live in the environment. And so even if they're not in the animal, if they do tend to jump into the environment, they can stay there for quite some time.

Definitely one of the biggest ways would be to give flea and tick preventatives all year round.