Most of the internal parasites live in the puppy s intestine. Their eggs are usually transmitted through the soil from other infected feces. Some indications of internal parasites include vomiting, diarrhea, blood in the stool, poor appetite, lethargy, or weight loss. A veterinarian can examine a sample of the puppy s feces to detect parasites. External parasites such as fleas, lice, and ticks, can cause skin damage and can infect a puppy with disease.
Fleas feed on the puppy s blood and cause itching.
Once a flea is swallowed, it can cause tapeworms. Ticks can transmit Rocky Mountain spotted fever as well as lyme disease. It is best to seek the advice of your veterinarian to treat parasites, both internal and external. Canine Lexicon . Hart, Ernest H. Encyclopedia of Dog Breeds .