Veterinarians concerned about increased heartworm cases in Ventura County » Ventura County Star Mobile
Dogs in CA should be on prevention.
The fast kill method is painful. The slow kill method is not. However, side effects from either method can cause pain and suffering. Standard of care is Immiticide therapy (fast kill). Slow kill looks good on paper but really read up on it of going this way. Heartworm experts do not recommend it.