Why is my cat's voice hoarse?
1. Throat irritation
When cats meow frequently or cough persistently, their throats may become irritated, leading to hoarseness. In this case, the cat needs to rest quietly and avoid any excessive exercise or stimulation.
2. Caused by infection
Cats may develop hoarseness due to viral or bacterial infections. This symptom may be accompanied by fever, coughing, or a runny nose. If you notice these symptoms, take your cat to a veterinarian immediately and follow their treatment recommendations. 
3. Dental problems
Poor dental health in cats can lead to malocclusion, which in turn can affect the throat and vocal cords. If you suspect that dental problems are causing hoarseness, you should take your cat to a veterinary clinic for examination and necessary treatment.
4. Excessive use of voice
If a cat meows or howls loudly for extended periods, it may overuse its vocal cords, leading to hoarseness. Soothing its throat and allowing it to rest can help alleviate this symptom.
Summarize
If your cat develops symptoms such as a sore throat, cough, or fever, you should take it to a veterinarian for examination as soon as possible. In daily life, pay attention to your cat's diet and lifestyle, and avoid exposing them to potential irritants or subjecting them to excessive exercise to ensure their health.