Susan, you might want to have your dogs checked for lyme disease if they have 
been outside alot . My vet just told me that they are seeing more cases of this 
in dogs.they are frequently diagnosed with arthritis and or ms just like 
humans. Just a thought and it may not apply at all. The reason I mention this 
is that sometimes the treatment  for ms or auto immune diseases involves the 
use of steroids and using steroids if one has lyme is very very bad.It will 
drive lyme deeper into the tissues(at least with human hosts)
       
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