Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to treat heartworms in dogs [title] Get injection treatment. [step] The official treatment for heartworms is a medical injection of immiticide (melarsomine). This treatment starts off with one injection given to your dog at the vet.

Ending1: This is considered intravenous medication that blocks the production of extra cells and has taken effect in between 24 hours and 4 days. In severe cases, your vet can inject this form of treatment through injection into your dog's skin. Ending2: It's intended to kill the parasites that cause heartworm inflammation in dogs. When you get the injection, you'll need to make sure to administer eight hours at the vet's office. Ending3: Four to six weeks later, this is followed by two more injections that are given 24 hours apart. [substeps] This treatment kills the adult worms, which will disintegrate over time and be absorbed by your dog's body. Ending4: However, it may be done for multiple weeks in a row. However, the latter injection is meant to kill the disease if the dog gets it in her body.

Answer format: ending1/ending2/ending3/ending4