Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to deal with common mating problems in dogs [title] Make sure your dog gets a pre-breeding health check. [step] Before you decide to breed your dog, you should make sure that they are healthy enough to do so. Make an appointment with your vet.

Ending1: If you have congenital health problems, and your dog is alert and well rounded, they may be able to control and prevent this issue. [substeps] Your vet will run some tests to confirm that your dog is healthy enough to breed with a dog other than yours. Ending2: Explain that you are planning on breeding your dog, and ask the vet to examine your dog to ensure they are healthy enough for breeding. [substeps] Dogs can also contract sexually transmitted diseases (stds), so you need to make sure your dog is tested before you breed it. Ending3: A pre-breeding staff can check your dog's feces and complete an initial screening of their health. These are some of the following tips about the timing of any breeder support : [substeps] Your dog's condition can provide a good time to get a pre-breeding health check. Ending4: Ask your vet if they know any normal procedures for both adult and neutered dogs to ensure that your dog is healthy enough to undergo neutering. [substeps] If your dog has an unpleasant or negative history, such as low blood pressure, a history of sexual misconduct, or illnesses, they may not be a good breeding choice for you.

Answer format: ending1/ending2/ending3/ending4