Internal dog parasites Internal dog parasites Your dog will likely experience a lot of good times and bad ones throughout its life. Some of the worst might be how it feels when it has an internal parasite. We re talking about the awful worms that infect your pet s insides and make it feel sick. Different internal parasites give your pet different symptoms.
Roundworms are fairly large worms that can grow to be four or five inches long.
These worms inhabit your dog s internal organs, namely its liver, heart and lungs. When they re done there, they will work their way down to the small intestine and eat your dog s food. Another major parasite in pets is the hookworm. These are curly creatures that are very tiny and are often found in large groups. They can be very problematic for your dog, because they eat the food in your dog s stomach and also suck your dog s blood.