It's essential to trust your vet's assessment, but also to be persistent. Here's what you should do:
1. Ask for clarification: If you're unsure why the vet believes there's nothing wrong, ask for a detailed explanation. Understand their reasoning and the tests they performed.
2. Get a second opinion: If you still have concerns, it's perfectly valid to seek a second opinion from another veterinarian.
3. Keep monitoring your cat: Pay close attention to your cat's behavior, appetite, and any other changes.
4. Document everything: Keep a record of your cat's symptoms, including the color and amount of blood, and any other changes you notice.
5. Consider further testing: If the vet initially dismissed your concerns, you can ask for specific tests to rule out any underlying conditions.
Remember, it's crucial to be proactive with your cat's health. Blood in the stool can be a sign of serious issues, so even if the vet initially found nothing, persistent follow-up is essential.