TTC and we have 3 Dogs!

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So my husband and I are now TTC our first child and we have 2 dogs and getting a new puppy soon! Jordan is my 10 year old female Westin/silky mix (15lbs) and Khal Dogo is our 90 lbs Dogo Argentino who is now 1 year. We are getting another female Dogo soon and I although I’m not pregnant having 3 dogs and a baby sounds like a lot. Any tips on how to prep these dogs for a baby coming into the family?