Have been to the vet twice this week. Great team they have. 12 yr. old black lab. Had blood work done. Most ranges were all normal. Possible early Liver cancer. She was full of water and had bad diarrhea. Took meds for that. Urine is dribbling out of her now. I will call vet tomorrow. I was just curious if pain med tramadol could attribute to this? Thank you, liz