Here's what you should do:
1. Observe your guinea pig closely.
* Is the hacking noise accompanied by other symptoms like sneezing, coughing, wheezing, lethargy, or loss of appetite?
* Is your guinea pig having trouble breathing?
* Any changes in their droppings?
2. Schedule an appointment with your veterinarian as soon as possible. They can examine your guinea pig, determine the cause of the hacking, and prescribe the appropriate treatment.
Possible causes of hacking in guinea pigs:
* Upper respiratory infection (URI): This is a common cause of hacking, sneezing, and other respiratory symptoms.
* Pneumonia: A serious lung infection that can be caused by bacteria, viruses, or parasites.
* Allergies: Guinea pigs can be allergic to dust, pollen, mold, and other allergens.
* Foreign object in the respiratory system: A small object, like a piece of hay or bedding, could be lodged in their airway.
* Dental problems: Overgrown teeth can cause difficulty breathing and hacking.
While you're waiting for your vet appointment, you can:
* Keep your guinea pig warm and comfortable.
* Provide fresh water and a nutritious diet.
* Avoid exposure to smoke and other irritants.
Please remember that it's crucial to seek professional veterinary care for your guinea pig. They can provide the best diagnosis and treatment for your furry friend.