An environmental cause can include a drug, alcohol or a disease the mother has that can increase the chance for the baby to be born with a birth defect. An agent that can cause a birth defect is known as a teratogen. Multifactorial birth defects are caused by a combination of genes and environmental exposures.
National Rescues. Lyme Disease May Cause Sudden Aggression in Dogs Written by Betsy Sommers of. Peppertree Rescue, Albany, NY, USA. 28th May 2004: We recently had a very strange event that I think we should share around the rescue community. A Young (~2 years) Lab mix, male, came into our program with a questionable background.
Lyme disease is a disease caused by a bacteria known as Borrelia burgdorferi. The disease is transmitted through the bite of a tick. Lyme disease is considered a zoonotic disease because it can infect both dogs and people. It does not appear to be a major threat for cats. Your dog can get Lyme disease if he is bitten by an infected tick. Canine Lyme disease is not directly contagious from one dog to another however. In dogs, the most common sign of Lyme disease is lameness which may shift from one leg to another. Other signs include fever, depression, lack of appetite and irritability.