I have fallen in love with a beautiful stray sheperd mix that has been coming around since my neighbors dog went into heat.He was extremely underweight and infested with ticks, also very afraid of people. I started to feed him and little by little he let me help him with his ticks and ears and so on. Now he is always around and we love him so much. I have not had him tested but I am so sure he has heartworms and is in his final stages. He can barely breathe and he is very sleepy and weak. Is there anything I can do? I do not have a dime to take him to the vet and I know that treatment is so expensive, I just cant sit back and watch this great dog die. What about the zapper? Has anyone tried anything like this on their animals? Please help!!