What symptom is associated with roundworms in puppies and kittens?

The correct choice relates to the weakness often observed in puppies and kittens infected with roundworms. Roundworms are a common intestinal parasite in young animals, and they can lead to a range of health issues as the worms consume nutrients from the host's body. This nutrient depletion can result in weakness and a failure to thrive, as the body does not receive the necessary energy to grow and develop properly.

Additionally, symptoms of roundworm infection in young animals can include vomiting, diarrhea, and a bloated abdomen, all of which may contribute to the overall weakness. Weakness is a critical sign that indicates the animal's health is compromised due to the presence of these parasites.

The other options do not directly connect with the typical symptoms of roundworm infection. Disorientation is more commonly associated with neurological issues or severe illness. Excessive energy is usually not a symptom seen with parasitic infections like roundworms; instead, affected animals often appear lethargic or unwell. A skin rash is typically related to dermatitis or allergic reactions, not intestinal parasites. Therefore, weakness is the most appropriate symptom linked to roundworm infection in puppies and kittens.