Maybe it's due to the leg, but my dog acts very weak and strange when it's right front leg is lame. this is a recurring thing that comes and goes, sometimes appearing in the rear legs to a lesser degree. Mainly, the right front leg goes lame and she limps. What can cause this what is it? I don't know of any injury, hasn't been hit by a car, maybe my other dog has wounded it but I don't think so. I just think its a weak leg.
I just think its a weak leg.

When it comes to things like this I typically consult my Vet. An office visit for me to know what is going on is always well worth it as far as I am concerned.
Make an appointment to see your dogs Vet.
Gwen
Maybe it's due to the leg, but my dog acts very weak and strange when it's right front leg is ... car, maybe my other dog has wounded it but I don't think so. I just think its a weak leg.

It could be any number of things, such as a foot problem, to arthritis to genetic skeletal problems (such as elbow dysplasia or luxating patella), to something such as Lyme's disease (see:
http://www-2.cs.cmu.edu/afs/cs.cmu.edu/user/jake/mosaic/lyme.html for more details on this).
Definitely a trip to the vet would be in order, palpation and/or X-rays to rule out muscle or skeletal problems, and other blood tests thereafter to see about other potential issue.
Shelly & The Boys