Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to detect canine bladder stones [title] Watch out for blood-stained urine. [step] Bladder stones rubbing against the delicate mucous membrane lining the bladder may cause it to become inflamed. When the bladder lining becomes inflamed it is prone to bleeding.

Ending1: It is sometimes difficult to remember if the urine has contaminated the lining of the bladder in order to stop the bleeding from the bladder. Blood-stained urine may also have a greenish/dark tint to it. Ending2: This blood collects in the bladder and is passed out when the dog urinates. [substeps] Stones that are smaller than the diameter of the urethra should pass out with no problems. Ending3: The infected blood in the bladder lining may eventually enter the brain, causing the stone to deactivate. [substeps] If you suspect that your dog may be suffering from bladder stones, seek medical attention right away. Ending4: [substeps] If your dog is wearing an elizabethan style (t-shirt or pad) set it on a cloth pad and dry it with the cloth. Do not change it to a damp pad.

Answer format: ending1/ending2/ending3/ending4