Dog Limping and low platelet count

My dog started limping one day. After visit to vet we found a small wound in his paw(back leg) and came back with antibiotics and rest treatment. He was still limping after the antibiotic treatment and healed wound for months. Then one week he suddenly developed a lot of fever 103 F and was inactive. Vet did lots of xrays and blood tests and got low platelet counts. Did the blood test again and got low platelet count again and vet said it could be Heartworm. They took him for another xray and bumped my dog or something and my dog stopped limping after that !! A couple of days later he also was fine and blood test came normal. I dont know what happened here. and whether i should keep a lookout for certain problems?

[ginger899]

It might be a good idea to get your vet to check for Tick-borne diseases. But usually along with the low platelet count, there could be some anemia. Did the vet say she had any anemia?
I think certain Tick-borne disease have periods of 'dormancy' The best thing is to run a test for this.

I am not saying it is this. Just one of my 'hunches' and I could well be wrong. But it's worth asking.