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Hello - we have a 100 lb chocolate lab, who will be 6 yrs old in March. He has been 100% healthy for his entire life until 10 days ago, when he suddenly was lame. Things went downhill from there. He wouldn't eat and cried out in pain most of the time. After several visits to the Vets and many tests (lots of blood work, Xrays and biopsies) the Vets are at a loss as to what is wrong with him. They have ruled out cancer, lyme disease and other diseases. He seemed to be making progress yesterday and we were hopeful that there was light at the end of the tunnel. Last night I picked up antibiotic from the Vets for another week, but they discontinued the pain medication. Unfortunately, our dog is back to where he was 10 days ago now. He won't eat, is very lame, and cries out in pain every time he moves. We would be very appreciative of any thoughts or suggestions. Thank you very much.
 

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Those symptoms are really quite vague and without knowing more it’s difficult to even speculate. Never mind the fact that only a vet can make a medical diagnosis, which no of us are, and it’s impossible to do a physical exam thru the internet. That being said, when you referr to several vet visits are those all at the same vet hospital? If so then you might want to try getting a second opinion from a different vet. If you already did that then you might have to bite the bullet and take him to a specialist.

Based off the limited info given, my first thought after reading that he’s a 6 yr old 100 lbs Lab with acute lameness was an ACL injury. The age, breed, and obesity are all textbook predispositions for an ACL injury. Has anyone done X-rays on him or manually checked the position of his knee joint?
 

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You should get him to another Vet for another opinion. There are so many things it could be, possibly a spinal injury. Regardless you need a lot more help than any of us can be online.
 

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There's a whole bunch of tick diseases that are either new or not commonly checked for like Rocky Mountain Spotted Fever. Also Lyme doesn't always show positive when it is, depending on where it is and how sensitive the particular lab is. Some doctors and vets feel a low enough titer isn't enough to cause illness but my old horse got extremely sick with a very mildly positive titer. Everyone has different levels of sensitivity and atypical symptoms do exist.
Tickborne diseases are much more widespread and common than many doctors and vets like to admit, at least some of them.
Good luck.

And [EDIT] you don't know that this dog is obese, or what kind of lab he is. My friend has an English lab who's 130 pounds and the vet said he's in good weight, not obese at all. His father and grandfather were each 150 pounds. Depends on the bone structure, muscle tone and build.
 

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Breed standard up to 80lbs for males. Hes clearly bigger than most. Carrying more weight than his skeleton is set to take, maybe obese, maybe not but outside breed standard. But how upsetting hes back to crying in pain now off analgesics. I reckon most vets can feel ACL injuries. So i guess its unlikely. What does your vet have planned next? Clearly cant leave dog like this. O feel for you both- you feel so helpless in times like this. Try contacting breeder too. Whilst theyll lie n say their lines dont have any history they may know of suggestions specific to the breed.
 

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Lots of different things could be going on here. Where you live has a big role in what tick borne and other infectious diseases could be present. If just back legs are affected then cruciate rupture is a possibility though I suspect unlikely given your description. In some dogs, especially large dogs it is actually hard to feel this without sedation or anaesthesia. I guess when you say biopsy you mean joint taps - as in samples of fluid taken from the affected joints? If not then that could be the next step. if the lameness is multiple joints and those affected seem to change then immune problems can cause this. Spinal issues too are possible which ideally need MRI.
bottom line is could be any number of things and you either need to work with your vet, get a second opinion or refer to a specialist if everything is drawing up a blank.
Good luck, hope you get some answers soon
 
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