Hi Carol,
 
I've used CS for at least 12 years on all my kitties, on several friends' pet animals and all my immediate family's dogs and cats, several rescued animals and 1 tiger, plus loads of roadhit opossums. 
 
I have never seen nor heard of a color change such as you are describing, nor anything involving skin (or fur) color change in an animal anywhere, at anytime. Several animals I know of have been getting daily CS for years (in with their water), and they are doing fine, thanks to the CS and their owners.
 
I use CS that I make myself, I don't buy it anywhere.
 
You have mentioned the possibility that your dog may have been on steroids or antibiotics at the time as well. I  have never read of CS interacting adversely with any medication, (I have in fact read that it doesn't) with the possible exception that it may make certain antibiotics work better.
 
I'd be more suspicious of the steroids and other pharma stuff, myself.
 
Another possibility:
Perhaps your dog's circulation was being temporarily attenuated by illness or medication, which resulted in his/her extremities getting less Oxygen? Like a person having blue lips or blue fingernails when they are short of Oxygen, or when the Heart is being affected by something. 
 
Then perhaps as the dog got better (Medication stopped, changed or circulation situation corrected), the normal coloration was able to return.
 
So my answer to your question is "I do not know", but you have asked for input, and there is mine, unless something else occurs to me down the road.
 
Please note that I have modified the topic line, since the other way implied a foregone conclusion that CS must certainly be at fault. Unless you unknowingly gave the dog a silver product that is different than what we are making, I truly do not see how silver could be what caused the change you describe.
 
BTW if you gave CS to your dog, you did nothing to hurt the dog, and the CS is probably what helped him/her get better. I have seen many animals' lives saved by CS when allopathic-only vets were doing nothing but killing the animal, albeit very expensively. Because of the number of times CS has been the only thing that made a significant positive difference, I will never, ever hesitate to use it with any animal that I think needs it.
 
So if someone who is unfamiliar with CS has told you or implied to you that you caused the problem by giving your dog the CS, please do not believe it. There are too many of us who know better.
 
Stay well,
 
Linda
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