Lead Toxicity in Dogs
Lead poisoning (toxicity), a condition in which increases levels of the metal lead is found in blood, can afflict both humans and dogs through both sudden (acute) and long-term (chronic) exposure to the metal. Through the ability to substitute itself for calcium and zinc (both important minerals for normal cell functions), lead damages the cell and affects normal biological processes.
Although a high number of lead poisoning cases are seen during the warmer months of the year, there is a wide variety of sources of lead -- many of which vary between different geographical and ecological locations. Older homes and buildings, for instance, are common sources of lead poisonings, as they can be riddled with lead dust or chips from lead paint.
Lead poisoning is more common in young animals and in dogs living in poor areas. However, cats also succumb to lead poisoning.
Symptoms and Types
The symptoms for lead poisoning mostly relate with the gastrointestinal (GI) and central nervous system (CNS). GI systems, for example, are seen with chronic and low-level exposure, whereas CNS symptoms are more common in acute exposure in young animals. Some of the more common symptoms include:
- Poor appetite
- Abdominal pain
- Regurgitation (due to megaesophagus)
- Hysteria, extreme anxiety
- Ingestion of lead – sources can include paint chips, car batteries, solder, plumbing material, lubricating material, lead foil, golf balls, or any other material containing lead
- Use of improperly glazed ceramic food or water utensil
- Lead-contaminated water
You will need to give a thorough history of your dog’s health leading up to the onset of symptoms, including a history of any contact with material containing lead, if possible. After recording your dog’s history, your veterinarian will perform a complete physical examination. Laboratory tests will include complete blood count, biochemistry profile, and urinalysis -- the results of which may reveal valuable information for initial diagnosis.
Blood testing may reveal red blood cells of unequal size (anisocytosis), abnormally shaped red blood cells (poikilocytosis), variations in red blood cell coloring (polychromasia, hypochromasia), and increased number of neutrophils (type of white blood cells). Urinalysis results are often non-specific and in some patients, abnormal concentrations of glucose may be seen in urine.
If your dog is showing all of the appearances of lead poisoning, your doctor will use more specific tests available which will help your veterinarian to determine the levels of lead in both blood and body tissues.
A condition of the cells; means that they are abnormally shaped
A condition that involves multiple colors
An in-depth examination of the properties of urine; used to determine the presence or absence of illness
The term for an esophagus that is enlarged abnormally
The prediction of a disease’s outcome in advance
The digestive tract containing the stomach and intestine
A condition in which cells are unequal.
The whole system involved in digestion from mouth to anus
Anything having to do with the stomach
Term used to imply that a situation or condition is more severe than usual; also used to refer to a disease having run a short course or come on suddenly.
Irritating tissue with a great deal of some type of fluid