1 Mites live naturally on dogs, but any mite in sufficient quantity can cause skin problems.  Two common types of mites that can cause mange are Demodex canis, which causes demodectic mange, and Sarcoptes scabei, which causes sarcoptic mange.
Ad. One area in which osmoreceptors are found is in the brain, specifically inside the hypothalamus. They regulate the amount of vasopressin, a hormone which tells the kidneys to retain water, which is expressed by the hypothalamus.
An autoreceptor is a receptor located on presynaptic nerve cell terminals and serves as a part of a feedback loop in signal transduction. It is sensitive only to those neurotransmitters or hormones, that are released by the neuron in whose membrane the autoreceptor sits. Canonically, a presynaptic neuron releases the neurotransmitter across a synaptic cleft to be detected by the receptors on a postsynaptic neuron. An autoreceptor will detect this neurotransmitter from its position on the presynaptic membrane.