What do you do if your dog has heart worms and is throwing up blood?

There are several things you can do about heartworms in pets. First, you can keep your pet on a monthly heartworm preventative, which is over 99% effective at preventing heartworm infestations in dogs and cats. Second, you can help reduce your pet's risk of getting infested with heartworms by avoiding peak times for mosquitoes, which is dawn and dusk around standing pools of water. Third, if your dog is infested with heartworms, there is an effective cure for them. It is risky for the dog - some dogs die of complications of heartworm treatment - but it will eliminate the heartworm infestation in your dog. There is no effective treatment for cats because they are so sensitive to the adult worms that they typically die of the infestation before treatment can be started; the good news is cats are quite resistent naturally to heartworm infestation in the first place.