I definitely agree that she needs a vet check. Perhaps her insides are hurting her, not her feet.
I have a little one(4lbs) and he is way more temperature sensitive than my bigger boy(8-8.5 lbs). He get's cold when it's under 70 degrees...and he's constantly in clothes. He wears pj's a lot and I layer over those with sweaters and sweatshirts. He also spends a lot of time on my lap where it's warm and he never used to be a lap dog |