worried!

Question
I have a yellow lab that is a little over 5 months, what I'm worried about is that the people we rent our horse barn to bring their male terrier out with them everyday when they feed their horses. He is not neutered, is Millie still to young to get pregnant or should I be concerned. She has not shown any signs of going into heat yet. Thanks for your help!  

Answer
Christine,

I cannot tell you when she will go into heat, it just depends on the individual dog. My suggestion to you is to get her spayed before she goes into her first heat that way you will not have to worry. The more times you allow her to go into heat, the higher a chance that she will develop cancer in the future.