Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to safely keep your dog in the yard [title] Check the weather. [step] Extreme heat or extreme cold can potentially kill dogs left outdoors. Some dog breeds, like pugs, are particularly sensitive to extremes in temperature.

Ending1: The best house temperature should remain above 180 degrees fahrenheit (21 degrees celsius) for most dogs. It is best to contact your veterinarian for recommendations. Ending2: If you're not sure if your dog is susceptible to extreme heat, check the forecast before you place your dog in an area where there is a lot of precipitation. Check the weather channel for a temperature range that is between 7.7 and 9.6 degrees fahrenheit. Ending3: You should never leave a dog unattended outdoors for prolonged periods of time, especially if the weather is going to be very hot or very cold. Humidity and wind chill can also endanger a pet. Ending4: In the months leading up to christmas eve, keep the dog on a leash in places with cooler temperatures. Anything at that temperature could freeze and cause major harm to the dog if left outdoors.

Answer format: ending1/ending2/ending3/ending4