Hi Bethany:
What a lucky puppy!!!!
What is your budget? Where will you be shopping, brick and mortar, on-line?
If there are no underlying health issues fresh dog appropriate foods and/or canned foods can help with weight gain.
Did the Vet specifically check for giardia and coccidia? These are sometimes hard to detect and the tests might need to be repeated to be certain they are not the issue. Here’s some info:
http://www.veterinarypartner.com/Content.plx?A=2386
http://www.veterinarypartner.com/Content.plx?A=680
I would be more inclined to think a dog with bad breath has stomach or dental health issues. Tarter can build up and create quite an odor if an owner is not brushing their dogs teeth regularly.
