My 8-month-old dog mated, was it her first heat, and is she pregnant?
I recommend you have Molly seen by your vet to make sure she is okay. Dogs usually go into heat around 6 months of age, but can also go into heat earlier, and often the first heat is not noticeable, as there is not always a lot of visible discharge. She may be pregnant, so speak to your vet about what your options are regarding that as well, and if you want to keep the puppies to term. I recommend having Molly spayed and your other dog neutered to help reduce the risk of unwanted pregnancies, certain undesirable behaviours, and certain diseases. See the link below for more information:
https://www.avma.org/public/PetCare/Pages/spay-neuter.aspx
Updated on September 23rd, 2025