My baby girl has the same fur, very thin. She has always had this fur and she is now 1 yr old. She also has very dry skin so I wondered if that was culprit. She has been on all foods from Primal raw to Solid Gold Wee Bits kibble. I have used fish oil on her food, given her grain-free and grain-filled (lil' over-exaggeration
Overall, I think it's genetics. If I keep it a little longer it doesn't look as thin. But she is who she is and I lover her for it