Mar 8, 2009 #1 H Harmoni New member Joined Oct 12, 2008 Messages 3 Reaction score 0 Points 1 I have a female Jack Russell Terrier/Sheltie mix. I am wondering when she will go into heat. Everyone says around 6 months of age, but my puppy is almost 10 months (will be on March 28th) and hasn't been in heat yet.
I have a female Jack Russell Terrier/Sheltie mix. I am wondering when she will go into heat. Everyone says around 6 months of age, but my puppy is almost 10 months (will be on March 28th) and hasn't been in heat yet.