Many tiny hair-like cilia protrude from the olfactory receptor cell's dendrite into the mucus covering the surface of the olfactory epithelium. The surface of these cilia is covered with olfactory receptors, a type of G protein-coupled receptor.
Respiration -10 to 30. The normal respiratory rate for dogs is 16 to 20 breaths per minute. The normal heartrate is 70 to 160 bpm. Large dogs tend to have slower heart rates so your dog should be in the 70 to 120 bpm range. This varies according to the cardiovascular fitness of the dog, too.
Normal Heart Rate for Dogs. You can feel your dog's heartbeat on the left side of the chest at the area where a raised elbow will touch the chest. Your dog should be calm and quiet. Place your hand over this area of the chest and feel for a heartbeat.