HI-
Ask a second opinion, but I thought my dog had constipation, so I called a retired vet and he said Metamucil. He said if it didn't work, then there may be a blockage in the rectum area. LUCKILY "Daisy's" problem went away. We didn't give her metamucil though soit was a false alarm that she had a constipation problem.
ALSO, Daisy is on "Expecta" all natural DHA oil. 60 lbs (400 mg each morning and 2 at night- this is anti-cancer. We decided no on perixicam and Daisy was diagnosed in Dec..Amazing !! Not in pain either and has an appetite. Spinich mixed in with white chicken breast with Innova Wet dog food is all we are doing. PLUS flaxiol 1 tablesppon with 1/4 cup cottage cheese each mornig and at night !!
Good luck !! All the best..