This is especially true while your dog is in bed sleeping. Smaller breeds and puppies usually tend toward faster pulse rates, while larger breeds and healthy dogs who get plenty of exercise often have a slower pulse. If your adult dog comes down with a kidney dog disease then that means that his kidneys have sustained some type of damage that is inhibiting their ability to strain and eliminate the wast products.
Now that's a classic crossed-up signal, since it rewards the dog for her antisocial behavior; a more appropriate response would be a good sharp vocal and physical correction (more on those to come).
Dogs learn at very different rates, and by the way, slower doesn't necessarily mean dumber. These are all examples of warning signs that may accompany an illness and you may have to do some minor investigating. Creatures with advanced brains can think.
Wool and other fibers, non-digestible plant material, rubber, plastic, wood, and even their own hair are just some of the things a dog may choose to ingest.