Photo Editing: Dog Insertion to Studio Background

I need a photo editing expert who can seamlessly put these two separate dog photos together. I need the same studio background and for both dogs to look like they belongs in the same image with the Christmas tree. The final image needs to be of print quality.

Ideal skills and experience for the job:
- Proficient in photo editing software (e.g. Adobe Photoshop)
- Previous experience with photo manipulation
- Attention to detail
- Ability to deliver high-quality images