Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to cure a cat of constipation [title] Monitor if your cat is urinating normally. [step] A healthy cat may urinate two to three times a day. Straining to urinate because of a bladder infection, bladder stones or a blockage are serious problems and very different than constipation.

Ending1: Go to your vet for a check up to see if your cat is always on their period. [substeps] Your vet may recommend castration, specifically since a huge blockage is developing that won't heal within a week. Ending2: If your cat is using a toilet, then the problem is not likely to be a medical issue. [substeps] If your cat urinates more frequently than normal, you may decide to replace her meal with diluted cat-friendly kitten milk. Ending3: Check your cat's litter box to see how much he is urinating every day. [title] Check how much your cat is defecating. Ending4: Rather than to check for problems, just take a time out, go to another room, and check back in. [title] Inspect your cat for constipation.

Answer format: ending1/ending2/ending3/ending4