Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to diagnose heart conditions in doberman pinschers [title] Monitor for respiratory distress. [step] One of the symptoms of heart disease includes different respiratory problems. These respiratory problems occur because the heart has trouble pumping oxygen to the body and your dog's heart has to work harder to get blood flowing throughout the body.

Ending1: [substeps] One cause of respiratory distress is high levels of platelet buildup in the hind legs. The lower the lower the level of platelet buildup, the higher the risk your dog may become ill or have a stroke. Ending2: Common respiratory conditions for a dog are : [substeps] Respiratory distress: this can occur due to lead blockage of the lungs, called albumin. This cause is similar to asthma and is particularly bad in early breeding dogs, but in slower breeds you may notice the respiratory distress becoming worse. Ending3: Signs to watch for include : [substeps] A wheezing or a stopped heartbeat. A decreased heart rate if it is failing to push blood to the heart. Ending4: [substeps] Your dog may exhibit an unusual shortness of breath, rapid breathing, or labored breathing. If these symptoms persist more than a few days, you should take your dog to the vet.

Answer format: ending1/ending2/ending3/ending4