What diagnostic test is most effective at detecting eggs in feces from a 1-week-old puppy with ascarid and hookworm infection?

Fecal flotation is widely recognized as the most effective diagnostic test for detecting eggs in feces when dealing with parasitic infections such as those caused by ascarids and hookworms. This method works by using a solution that is denser than the eggs, causing the eggs to float to the surface where they can be collected and examined under a microscope.

In the case of a 1-week-old puppy, a fecal flotation would typically yield viable eggs from ascarids and hookworms, assuming they are present. A direct smear may often miss eggs due to lower sensitivity compared to fecal flotation, particularly with infections that might have a lower egg count early in the infection. Owner observation is also not a reliable diagnostic method for detecting internal parasites since it cannot identify eggs or their specific types.

Overall, a fecal flotation is the preferred approach for these parasitic infections and helps ensure accurate diagnosis and effective treatment planning.