Not getting enough high quality protein in their diet is another potential cause of low blood protein levels in dogs and cats. (2ndchance.info)
If the problem is long standing and severe, your pets total blood protein level may be low due to its inability to absorb nutrients and leakage out through the intestinal wall. (2ndchance.info)
There is a limit to how limited the amount of protein in a diet can go before blood protein levels dip too low. (dogcare.dailypuppy.com)