Well it's not 100% lol..... My Dobe bitch's temp did not drop so I thought it would be safe to do some early Christmas shopping 4 weeks ago. Knowing she was due any day I started taking her temp 5 days before her date. On her due date, she had not dropped and well.....I THOUGHT I'd be safe and she had them while I was out decking the malls so to speak. Surprise for me,she had six pups, one had a birth defect and she knew instinctively to push it away, and I now have 5 beautiful Dobe puppies, now of course 4 weeks old. So do not totally depend on it for labor detection! And BTW she also ate a hearty breakfast that morning...FOOLED ME ABBY!
my friends chihuahua was eating to the day she went into labor.she did not know how to take the temp. but knew she was fixing to have when she hide up under the bed somewhere she would never go.and 2 hrs later she had her babies.so i guess it depends on the dog.good luck