Is my senior cat constipated? Vomiting, straining, liquid poop.

Thank you for contacting Petco Pet Education Center, formerly Petcoach with your question about Jasmine. Poor girl! It could be she has a GI illness causing the vomiting and diarrhea. Likely she has had some loose stools, and it's normal to see a cat act like they are trying to poop but have nothing come out. It's not constipation, it's just she still has the urge to go but nothing comes out. It happens in humans as well who have diarrhea. Unfortunately I cannot recommend giving Pepcid or Miralax without seeing her in person, it's illegal. I can give you a home remedy to see if that helps. Feed her a bland diet of boiled white meat chicken (no bones) in small amounts several times a day for a couple of days. Then slowly add back in his normal diet. If she vomits the bland diet, the diarrhea continues on the bland diet, stops drinking water, starts vomiting water, or becomes very lethargic, she will need to see a vet right away. Best of luck.