I'm going to bring home a puppy one day without warning my husband.
What is your purpose for wanting to surprise your husband with a puppy?
He loves dogs.
It's nice your husband likes dogs, but they are a lot of responsibility. It's bad to spring that on someone without notice. You should make sure he is ready to take on that responsibility before getting the dog.
He'll be so happy about it that he'll forget about his old job.
Even though he may love dogs, it is still a good idea to tell him before just bringing a dog into the house. Taking care of a dog requires a ton of work, so it is important that you know he's prepared to take it on.