A dog's leg may shake because of nerve responses, according to MentalFloss.com. This is known as the "scratch reflex," occurring when an owner playfully rubs a dog's belly. The nerves register the touch as irritation, sparking an involuntary movement of the legs. It is an instant reflex to scratch itchy areas of the body.Know More
MentalFloss.com also notes that it is a healthy reaction in dogs and a testing method veterinarians use to find out if the nervous system is healthy.
BigSiteOfAmazingFacts.com notes the various theories stemming from this biological reaction, such as scaring away predators, or to safeguard dogs against drowning.
A more serious reason can be traced to kidney disease, according to MyTCMVet.com. Kidney disease can cause low electrolyte levels and mineral deficiencies, resulting in muscle dysfunction. Adrenal problems can also be related to mineral and electrolyte imbalances. General muscle weakness can also stem from arthritis or any joint-related ailment.
VetStreet.com also touches on general muscle weakness, but adds fatigue as a possible cause. A dog's leg may shake after overexerting the limbs. Pain may also be a factor, particularly within the back or abdominal regions. Stress and general anxiety may also play a role, along with medications the animal may be taking.Learn More
Chihuahuas shake because they are cold, nervous, excited or have excessive energy. In rare circumstances, tremors can indicate medical conditions such as hypoglycemia or an allergic reaction. However, the most common cause for shivering in Chihuahuas is falling temperatures. Since they are small, they are more susceptible to cold temperatures.Full Answer >
According to Central Houston Animal Hospital, shaking and vomiting in dogs often signifies acute abdominal pain. Acute abdominal pain is caused by a variety of factors that include viral or bacterial infections, pancreatitis and gallbladder rupture. It is extremely important for dog owners to consult with a veterinarian as soon as possible to ensure proper treatment. Additional causes of shaking and vomiting in dogs include nausea, dehydration and Addison's disease.Full Answer >
According to petMD, localized involuntary muscle tremors can cause a dog's head to shake slightly. Involuntary muscle tremors can also cause a dog's entire body to shake. Localized tremors that affect only the hind legs are also common.Full Answer >
A dog that sheds excessively may be suffering from such ailments as parasitic or fungal infections, allergies, Cushing's disease, allergic reactions to medication, cancer or an immune disorder, according to WebMD. Dogs that lack proper nutrition are also prone to shedding more than normal.Full Answer >