(Portland, OR)  --  A study shows pets in Oregon are fatter and mangier than in other states.  The Portland-based Banfield Veterinary chain says 34-percent of dogs and 37-percent of cats in Oregon are overweight or obese.  That's twelve-percent higher than the national average.  The survey also shows 18-percent of cats and nine-percent of dogs have fleas.  Reasons for these numbers are unclear.