Does your rabbit shows lowered energy and/or appetite?
Does your rabbit have missing or excessive stools?
Does your rabbit have poor grooming habits?
Does your rabbit shows symptoms like nasal discharge, sneezing, coughing, breathing problems, including open-mouth breathing?
Is your rabbit's head tilted slightly to one side?
Rabbits show two significant signs of illness: decreased energy (or lethargy) and decreased appetite for both food and water. These are vague symptoms and can indicate any number of illnesses. Keep track of your rabbit's food and water consumption as it provides a quick way to spot if your pet is having health issues.
Rabbit gastrointestinal stasis (RGIS) is a common rabbit illness sign that occurs when the animal stops eating. This slows everything in the digestive system down and the bunny stops dropping stools. GI stasis might be a result of an inadequate appetite, as a lack of fiber, dental issues, or a secondary problem such as liver disease or cancer. Diarrhea or loose stools can be a sign of trouble, too, indicating a potential parasitic or bacterial disease.
Rabbits are known for keeping themselves clean. Therefore, any signs that the rabbit hasn't been cleaning itself, such as fecal matter staining paws or matted fur, is a sign the rabbit is unwell. Drooling, slobby or missing hair on the creature's hair and neck are also all indicators of illness, potentially dental disease. Additionally, dandruff, overall fur loss, or a scaly coat can be a sign of an infection that could be contagious to other animals or even humans.
Rabbits can only breathe through their noses, so an upper respiratory tract disease is a serious health problem. If it looks like your rabbit is suffering from a cold with symptoms like nasal discharge, sneezing, coughing, breathing problems, including open-mouth breathing, it needs to be seen by a vet as soon as possible.
If your bunny's head is listing to one side, the eye on that side seems to be having issues, or the rabbit has poor coordination, it could be suffering from a sudden onset of head tilt, a dysfunction of the system that controls the rabbit's balance.
Your rabbit appears to be healthy, but if it shows any unusual behavior or symptom you should have it checked by a veterinarian. Owners should know best when their pet is acting out of the ordinary.
https://www.thesprucepets.com/signs-that-your-rabbit-is-sick-1835739

Sreten null
Hi! I’m Sreten Filipović. I graduated from the Faculty of Agriculture at the University of Belgrade, with a master's degree in Environmental Protection in Agricultural Systems. I’ve worked as a researcher at Finland's Natural Resources Institute (LUKE) on a project aimed at adapting south-western Finland to drought episodes. I founded a consulting agency in the field of environment and agriculture to help farmers who want to implement the principles of sustainability on their farms. I’m also a founding member of the nonprofit organization Ecogenesis from Belgrade whose main goal is non-formal education on the environment and ecology. In my spare time, I like to write blog posts about sustainability, the environment, animal farming, horticulture, and plant protection. I’ve also published several science-fiction short stories.
You can find me on LinkedIn at https://www.linkedin.com/in/sreten-filipovi%C4%87-515aa5158/