Why is my cat losing fur and weight? Should I see a vet?

Sudden weight loss is always a very big warning light that should not be taken lightly, it's usually a sign of an internal disease that needs to be investigated, i strongly recommend taking Winter to the vet in order to get it checked, he will need to have a blood test done and possibly an xray as well in order to attempt to diagnose the reason for these symptoms.

Poor Garfield! Tapeworms do not usually cause any significant weight loss or other symptoms in cats, so I would be very concerned that Garfield has a more serious problem. I would recommend taking him to the vet for an exam when you are able to. He/she can do some diagnostic testing (blood work and x-rays) if needed to help determine what's wrong, and will get him started on appropriate treatment depending on what is found.

Sudden weight loss is always a very big warning light that should not be taken lightly, it's usually a sign of an internal disease that needs to be investigated, i strongly recommend taking him to the vet in order to get it checked, he will need to have a blood test done and possibly an xray as well in order to attempt to diagnose the reason for these symptoms.

Poor Rusty! Cats can have worms even if you don't see them in the feces. Oftentimes, there are eggs in the feces, but those can only be seen with a microscope. Sudden weight loss in cats can also be caused by diabetes, kidney disease, systemic illness, infection, or injury among other causes. I would have Rusty seen by a vet asap, and bring along a sample of his feces for the vet to examine. In addition to looking at his feces, the vet can do a physical exam, blood tests, and a urinalysis to diagnose what is causing his weight loss. Once the cause of the weight loss is diagnosed, the vet can discuss treatment options with you.

Significant weight loss is always a concern, especially if his appetite is good. Hormonal conditions such as diabetes and thyroid disease or poor absorption and digestion of his food is possible and I would recommend a full physical and blood panel as soon as possible in order to stabilise his condition before he becomes too frail

Hello. Weight loss of that amount is, unfortunately, going to require some investigation. If the cat’s feeding routine has basically remained unchanged, he has been dewormed....then we need to be looking for other, more serious problems. A thorough physical exam, bloodwork and possibly x-rays. He will likely need sedation for all of this, so presenting him to the vet in a humane trap that he can be sedated while still in the trap is the safest method for all involved. Reasons for dramatic weight loss could include diabetes, intestinal diseases, kidney or liver issues, cancer, etc. I deal with feral cats all the time and it is relatively simple to sedate them through the trap in order to do any procedures necessary. Good luck

Intestinal parasites can be picked up from the environment. If this is a tapeworm you saw (looks similar to a grain of rice), fleas can transmit tapeworm to cats. I would recommend treating Venus with a product called Profender, which will treat intestinal parasites including tapeworm. I would also consider using a flea and tick preventative such as Revolution or Frontline. I would also consider bringing a stool sample to a veterinarian to help diagnose what kind of intestinal parasites these could be. I hope this helps! Please let me know if you have any other questions or concerns and I would be more than happy to help you further.