Final answer:
The dog's symptoms indicate a nematode infection. Diagnosis involves examining the feces for the presence of eggs or worms. Treatment options include mebendazole, albendazole, or ivermectin.
Step-by-step explanation:
The dog's symptoms of laziness, distended abdomen, and presence of worms in the feces indicate a parasitic infection, specifically a nematode infection. Nematodes, also known as roundworms, are common in dogs and can cause various symptoms depending on the specific species involved.
Diagnosis of nematode infection involves examining the feces for the presence of eggs or the worms themselves. Treatment options include mebendazole, albendazole, or ivermectin.