Answer :
Final answer:
Out of the mite species given, the Demodex spp. is not contagious to other dogs. It is a part of the normal skin flora and only causes issues when the dog's immune system is compromised. The other mites are all contagious.
Explanation:
The mite which is not contagious to other dogs from the options provided is Demodex spp. Demodex mites are a type of mange that is usually non-contagious as it is part of the normal flora of a dog's skin. The mites only cause a problem when a dog's immune system is compromised, allowing the mites to proliferate which leads to symptoms. On the other hand, Cheyletiella spp., Sarcoptes spp., and Psoroptes spp. mites are all contagious and can readily pass from dog to dog, often causing skin irritations and discomfort.
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