Why is my cat hiding? When "off" behavior needs a vet
Written by Dr. Cassie Knapp, DVM
Co-Founder & Chief Medical Officer, UrgentPaws
Published August 11, 2026
The short version
- Hiding is one of the few illness signals cats reliably give. A cat who suddenly withdraws to an unusual spot deserves attention, not privacy.
- A cat who has not eaten for 24 hours needs to be seen. Cats are uniquely vulnerable to a serious liver condition when they stop eating.
- Open-mouth breathing or panting in a cat is always an emergency, unlike in dogs.
- Subtle changes — grooming, litter box habits, where they sleep — are often the earliest and most useful clues.
Why hiding matters more in cats
Cats evolved as both predator and prey, and visible weakness carries a cost. The result is a species that conceals pain and illness remarkably well, often until a condition is well advanced. By the time a cat looks obviously unwell, they have usually felt unwell for some time.
This is why owners so often say the illness came on suddenly. Usually it did not — the signs were quiet. Hiding is one of the few that reliably breaks the surface.
Normal retreat versus a warning sign
Plenty of cats have a favorite wardrobe or a spot under the bed, and a cat withdrawing after houseguests, a new pet, or fireworks is behaving reasonably. What matters is change: a new location, a longer duration, or hiding paired with anything else on the list below.
Likely behavioral
- Location — Their usual spot
- Duration — Hours, easing as things settle
- Appetite — Eating normally once out
- Response to you — Emerges for food or attention
- Trigger — An obvious one — visitors, noise, a new pet
Warrants a vet visit
- Location — Somewhere new, tight, or hard to reach — under a bath, behind an appliance
- Duration — Most of a day or more
- Appetite — Skipping meals, or not drinking
- Response to you — Will not come out even for a favorite treat
- Trigger — Nothing has changed
The quieter signs worth noticing
- Not eating — 24 hours is the threshold at which we want to see a cat
- A coat that looks unkempt, or conversely over-grooming one particular area
- Sitting hunched with feet tucked and eyes half closed, rather than curled or stretched out
- Litter box changes: straining, going more or less often, or going outside the box
- Reluctance to jump, or sleeping somewhere lower than usual
- Bad breath, drooling, or eating on one side of the mouth
- Weight loss you notice when you lift them
Two of these are different in kind from the rest, and mean a 24-hour ER tonight rather than an appointment tomorrow. Open-mouth breathing or panting in a cat is not the benign thing it is in dogs — it suggests significant respiratory or cardiac trouble. And a male cat straining in the litter box with little urine may have a urinary blockage. Come to us or a 24-hour ER, whichever is closer — we can start treatment and transfer him.
Why a cat not eating is urgent
When a cat stops eating, the body mobilizes fat for energy, and the feline liver handles that influx poorly. Fat can accumulate in the liver and impair its function — hepatic lipidosis. Overweight cats are at particular risk, and it can develop after only a few days without food.
That is the reason we treat a cat who has not eaten differently from a dog in the same situation. A dog skipping a meal is often worth watching. A cat skipping meals for a day is worth a visit.
What a visit looks like
Vague signs need a broad first look, so we usually start with a full physical examination, then in-house bloodwork and a urine sample. That combination catches the common culprits behind a withdrawn cat: kidney disease, hyperthyroidism, diabetes, urinary disease, pain from arthritis or dental disease, and infection. Imaging follows if the picture points that way.
Bring specifics if you can — when they last ate, when you last saw them use the box, and any photographs or video of the posture that worried you. With a species this good at hiding things, your observations at home are often the most useful information we get.
Dr. Cassie Knapp, DVM
Co-Founder & Chief Medical Officer
Dr. Cassie Knapp is a veterinarian with 17 years of clinical experience and extensive emergency room and urgent care experience. See full bio
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I took my cat to Urgent Paws to be seen for an eye and ear concern. I was immediately greeted by Christine (VT) and taken to an exam room. Christine was friendly and welcoming while explaining the services offered, including fees. Dr. Colon examined my sweet boy and was just as friendly and welcoming as Christine. My cat has been known to be slightly skittish during vet visits, but he was calm as could be during the whole process. I appreciated Christine and Dr. Colon explaining each step and answering all of my questions. Amazing service by staff who made it apparent they love their jobs.
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BEST VET CARE EVER!!! I'm extremely ashamed that it's taken me so long to write this, but I have been thinking about UrgentPaws for months. They set the standard for exemplary care! Pros: *Quick service: I came during the holiday season and waited barely 5 minutes to get into a room *Caring staff: My cat didn't want to leave! Everyone was cuddling him and giving him treats. *Transparent care: all the work is done in a room surrounded by windows, owners can see exactly what's happening and more importantly how their pets are being treated! *Rational doctors: yes that's right! The vet doesn't push unnecessary products or services. They talk through your concerns and recommend what's right for you and your situation. It's not a big sales pitch; it's genuine concern! Cons: I wish they were my primary care vets instead of only an urgent care. I would exclusively go to them. This is the best experience I've had in over 20 years of bringing my dogs or cats for vet care. My little ones are all healthy right now (fingers crossed), but it's a huge relief for me to know that if something happens, I can get care at UrgentPaws. It's one less thing to stress about during the anxiety of sickness or injury.
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We took our pup to Urgent Paws for a paw injury, and we couldn't have asked for a better experience. The entire staff was wonderful. From the vet techs to Dr. Sweitzer, everyone was patient, gentle, and genuinely attuned to our pup's needs. They followed our lead on what would keep her calm while they wrapped her injury, which made all the difference for our anxious pup. Dr. Sweitzer was especially fantastic. She encouraged all our questions and took the time to answer each one thoroughly and clearly. Her explanations were so educational, and you could tell she genuinely cared about our pup's wellbeing. It's so rare to find a vet's office that combines this level of compassion with thoroughness. If we lived nearby, Dr. Sweitzer would absolutely be our go-to vet. Highly recommend!
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Lucy S.
I found this clinic on Google because my dog was having a sudden allergic reaction starting last Thursday and I needed help urgently. I'm very satisfied with my experience. My primary pet clinic had prescribed a liquid steroid, but after taking it, my dog threw up three times on Saturday. Since last Thursday, he had been extremely itchy, crying through the night, scratching nonstop, trembling, and barely sleeping. By Sunday morning, he was trembling so much from the itchiness that I decided to look for another clinic and brought him here. They saw us right away. We met with the technician first, then spoke with the doctor. After discussing and explaning his symptoms everything, the doctor prescribed a steroid tablet and gave us a clear, detailed treatment plan. The doctor answered all of my questions thoroughly and confidently, which really helped me feel more at ease. I started following the plan yesterday afternoon, and my dog finally slept through the night for the first time in four days😭😭😭. Today, he was feeling so much better that he just even brought me a toy and wanted to play!!!! He had lost one pound in just four days, so I was really worried, but seeing him regain his energy made me so happy. I’m very grateful for the care we received here and would definitely recommend this clinic!!!!!!
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I was able to get in same day at Urgent Paws in Rancho Cucamonga when my 7 year old Lab (Cleo) seriously injured her back leg. The customer service and care we received were truly above and beyond anything I could have asked for. The entire staff treated us with such kindness, compassion, and genuine care. They were able to treat Cleo, help us understand the situation, and refer us to an Orthopedic Specialist for the next steps in her treatment. The following day, I received a follow-up call to check on how Cleo was doing, which meant a lot to us. I also received a quick response when I needed her medical records sent over to the Orthopedic Specialist. I would highly recommend Urgent Paws in RC to anyone. thank you so much to the entire staff! We truly appreciate everything you did for our sweet girl! 🩷
Elizabeth M.
I took my 17 year old dog for ear infections and used the save my place on the website it was great. Everyone was very nice to us they are not pushy with testing and things you don’t need. We saw Dr. Wong super nice. Pricing is reasonable. Most likely I will take my girlie back for her recheck. I would definitely recommend and I have been a frequent flyer to emergency vets!
Jacky O.
The care I received here was incredible… we have fed this cat for 6months now… and noticed 2 days straight she wouldn’t eat … also when I drove up to the drive way she didn’t move. After capturing , we came here! The vet pretty much told me from the start she would need to be hospitalized. She still ran test, and it was a lot more affordable then the hospital. Money aside, they even shaved her down and gave her a good cleaning. She had maggots growing at her eyes … just really rough shape. Where they treat the animals is in the center of the clinic, everything is windows. I really appreciate being able to see what they are doing. Not saying they are malicious, but something about being able to see your pet during their treatment , just gives more peace of mind. The office is very clean everything is well kept up. Honestly I was suppose to go to another hospital, but now they close at 7, but found this place instead. Honestly, everything worked out for the better. The vet even called a hospital and gave the vet on call a whole walk through of the case. You don’t understand how wonderful that was. To be referred for further treatment and not have to sit their and try to explain so much information. It’s a complicated case, she was on the phone for at least 15 mins… she didn’t have to do that. I am just so grateful, moving forward this is my new emergency go to. I can’t say enough good things about this place , hence the long review. Anyways, thank you guys !!!! Fluffers is now part of the family, long journey ahead, but will be given a fighting chance
Matt S.
We took our very sick cat here and were instantly put in our own private room. There is no waiting room they take you back immediately. All the staff was attentive and caring. The doctors are awesome and the staff is awesome we were worried sick and everyone there helped us know our baby was getting taken care of would definetly recommend to family and friends. Thank you Jimmie, Dr. Cabrera, Val , Dr. Patel and Sam!
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I couldn’t get an appointment with my regular vet, so I found UrgentPaws online and was able to get in right away when it was time to say goodbye to my sweet 16½-year-old dog, Stella. From the moment we arrived, the entire staff was kind, compassionate, and respectful. They brought us into a quiet, comfortable room with a couch, soft blankets, and calming music playing in the background. They even offered Stella whipped cream and a Hershey’s Kiss as a special treat. She was too sick to enjoy them, but the gesture was incredibly thoughtful and showed how much they cared. They carefully explained the process, went over the options for her ashes, and even collected payment beforehand so I wouldn’t have to think about that afterward. Although it was one of the hardest days of my life, I’m so grateful for the kindness and compassion they showed Stella and our family. They made sure she was comfortable and at peace, and I’ll always be thankful for the care they gave her in her final moments.
Carrie V.
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Madeleine K.
Really impressed by this place and the excellent and caring staff. We needed help fast on a Saturday when our regular vet was closed. Kira welcomed us into an examination room right away and took a very thorough history, and then Dr Martinez did a very thorough exam, explaining everything and asking lots of thoughtful questions. Everyone was kind and supportive, yet swift and efficient. The atmosphere of the place is very calm and everyone was caring and supportive. The cost of the medicine was no more than through our regular vet. I would definitely come here again. Highly recommended.