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neospora_caninum
 neosporosis, caused by an organism called Neospora caninum.
Neosporosis was thought to be uniformly fatal. Not necessarily because dogs couldn't live with the organism but because many couldn't and the rest were usually euthanized due to the severe disabilities induced by the parasite. To the best of anyone's knowledge at the time, Sandy,seen in picture,was the only adult dog functioning happily as a normal pet with neosporosis.  Sandy was severely crippled. She had rigid rear limbs that were terribly atrophied, almost making her appear to be walking with aid of crutches in the rear. She didn't know she was supposed to be too disabled to function so she was doing it anyway.
neutrophil_2
probable_staph_pyoderma

The biggest mistake that people make when treating skin infections is not treating them long enough. If an infection responds to antibiotics and then recurs, it is a really good idea to use antibiotics for at least 6 weeks and possibly 8 or more weeks, to try to eliminate the infection. If that doesn't work, it may be necessary to treat intermittently, or even to treat continuously, to control some skin infections.  Cephalexin is usually a good choice since most of the time these are staph skin infections.
I know of no evidence that staph skin infections from dogs are contagious to humans and there are only scattered reports in which vets worried over potential contagiousness between dogs. Most of the time these are normal bacterial residents of the dog's skin that just get out of hand because a particular dog has some problem controlling them.