Congrats on your new puppy. I also work full time and when Sophie Kate as a baby I would come home everyday at lunch time and take her for a walk and play with her for an hour.
I cannot remember are you crate training her? that is what I did with Sophie Kate and it worked well. Remember to make sure she goes to the bathroom before she goes into the crate and immediately when you take her out.
The part about leaving your dog and feeling guility, it will never stop. Almost 2 years later I still feel guilty and miss her every minute I am at work or away from her.
Good luck and keep up posted on her progress.
__________________ Cheryl,Mom to  SophieKate |