Finally, about 1-2 months later than I expected Tiya has today started her heat. I think she waited to get puppies when spring arrives so they can enjoy a lot of time outside with us before moving to their new families.
After about 10-14 days I will start to check her progesterone levels with bloodtests and when she is ready she will be inseminated with the semen from Erebos. 
Keep checking back for updates!