I need as much info as I can get!!! My Foster dog has a very bad case of heartworms and we are getting ready to start treatment. He is 8 to 10 yrs old and I have put enough weight on him to get him ready for treatment but have no idea what to expect. Pretty sure he has had them most of his life as I was told he has hundreds of them. We are going with the slow kill method because of his age and health. Any and all info would be greatly appreciated , ...this guy so deserves a second chance in life. thanks!!!!