My dog is shaking, panting, feverish, but tests are negative. Why?

These can be symptoms of many serious medical issues, anxiety, fear, pain, neurologic disease, infection, etc. I would recommend that you have him checked out by a vet to see what could be going on. After a thorough physical exam and discussion of his recent history, the vet may recommend diagnostics, such as blood work, x-rays, ultrasound, etc. to diagnose the cause.

Something is definitely making her feel bad, but this is not specific to any one problem. The fact that she has a high temperature makes me suspicious that she has an infection. The best thing you can do is have a vet check her out to identify and treat the problem. If you have further questions or need further clarification, then you may consider having an online consult with one of our vets on Petco Pet Education Center, formerly Petcoach. This way, you can send unlimited pictures and have a text conversation with a vet. I hope that helps and Maggi gets better soon.

Shivering can be a sign of pain, nausea, or a fever. Muscle tremors can look like shivering and can occur with some toxins or neurologic diseases. If the shivering continues I'd recommend having Zoey examined by a veterinarian.

Hello. Making any kind of assumption or diagnosis is very difficult just based on panting & shivering, but I can tell you this can be typical signs of pain & an elevated temperature. Since he has periods of normal behavior, my concerns is there is some underlying pain that JosLouis is experiencing. It could be from any area, so even if he quits the behavior, I would recommend having your vet check him out, just to make sure. Hope all is well soon. Thanks for using Petco Pet Education Center, formerly Petcoach.

Thank you for submitting your question regarding Zoey. I suspect she is sore from her long session of fetch on Tuesday. She may have some underlying arthritis that has been aggravated. I recommend that she sees a veterinarian to determine if this is the case. If so, pain medication can be prescribed to keep her more comfortable. In the meantime, do not give any over-the-counter pain medications as these can be toxic to dogs. I hope this information helps!

I think it is more likely that the high temperature was due to the seizures. Their bodies shake so much that it is like they just ran a marathon. The seizures could certainly be brought on by tick disease, but could also be caused by liver or kidney issues, infection, epilepsy, etc. For these types of cases, I usually hospitalize on IV fluids, run a CBC and blood chemistry and urinalysis and tick tests, and monitor for additional seizure activity throughout the day.

My next step would be to send off blood for a test for plague (Yersinia pestis) and Tularemia, especially if your dog has access to areas where there are rodents, squirrels and rabbits. These would not be included in regular blood work. You may also want tod discuss a disease called malignant hyperthermia with your veterinarian. Other common causes of "fever of unknown origin" would be tumors, however your vet apparently ruled those out with blood tests, ultrasound, and xray and possibly blood parasites such as Ehrlichia spp, Babesia spp and similar. A heartworm test may also be advisable.