My senior cat is peeing blood droplets and tiny amounts. What's wrong?

I am sorry to hear about your concern for Tibou. If Tibou has a normal energy level and has been eating and drinking, and is able to urinate, and if you press on her belly and she isn't painful then this is something that can probably wait until your vet opens in the morning. We can see urinary tract infections in older cats in particular females with kidney disease. A urinary tract infection can cause the symptoms you describe. Other possible causese could include bladder stones, sterile cystitis (inflammation of the bladder without infection), tumors of the bladder or other parts of the urinary tract, or primary renal hematuria. I would call your vet in the morning for an appointment where they can check the urine and may recommend imaging such as an x-ray or ultrasound. If Tibou is acting lethargic, has a painful abdomen, is vomiting or having trouble breathing, or hasn't been eating or drinking then a visit to the emergency vet is recommended. It is never wrong, however, to take your pet to the emergency vet if you feel very concerned and need peace of mind! If you wish to discuss Tibou further then you can use our Petco Pet Education Center, formerly Petcoach consultation service. Best of luck to you and Tibou!