Ask Dr. Paola - HELP! My Havanese Puppy Isn’t Eating! (October 5, 2026)
Welcome to our "Ask Dr. Paola" series, where every Monday we bring expert advice straight from Dr. Paola Cuevas (MVZ) to help our readers better understand their dog's health and well-being.
Whether you're a new pet parent or a seasoned dog lover, Dr. Paola is here to provide answers to your most pressing questions. From nutrition tips and preventive care to troubleshooting common behavioral issues, Dr. Paola is ready to offer insights that will keep your furry friend happy and healthy. Stay tuned for expert guidance on a range of topics that matter most to you and your dog, so you can make informed decisions and provide the best possible care for your canine companion.
Have a question? Send it in here!
HELP! My Havanese Puppy Isn’t Eating!
“Dear Dr Paola,
I purchased my Havanese, Paisley, at 8 weeks. She hasn’t eaten any food for three weeks now. That makes her blood sugar drop. I have taken her to the emergency vets twice and my regular vet numerous times.
They have run multiple liver tests but can't find anything wrong with her. I have been hand-feeding her the prescription sugar water the vet gave me, but I have to force her mouth open to give it to her.
Have you ever heard of anything like this?“
- Angela
Dear Angela,
A tiny puppy has limited energy reserves, so when she stops eating, her blood glucose can fall quickly. This is one reason we normally feed puppies several times throughout the day. However, three weeks without eating is much more concerning than simple “puppy hypoglycemia.” Sadly, once a puppy stops eating, this can become a vicious cycle because low blood glucose can cause weakness, abnormal behavior, and even less interest in food. Sugar can temporarily raise her blood glucose, but it does not address the underlying problem. And since Paisley has been refusing food for several weeks, this deserves some serious detective work.
Normal liver blood tests are reassuring, but they do not completely rule out every condition that can cause chronic inappetence or recurrent hypoglycemia in a puppy. Depending on what has already been evaluated, your veterinarian may also consider additional investigation for conditions such as infection, gastrointestinal disease, congenital portosystemic shunting, adrenal disease, or other metabolic disorders.
A portosystemic shunt (PSS) is an abnormal blood vessel that allows some blood from the digestive system to bypass the liver instead of passing through it normally. Because the liver plays an important role in processing nutrients and maintaining normal metabolism, this abnormal circulation can cause problems in some puppies. More specialized blood tests and imaging, such as abdominal ultrasound with Doppler evaluation or, in some cases, CT angiography, may be needed to investigate these conditions.
The Havanese is among the breeds with a higher risk of PSS, so if it hasn’t already, I think this should be thoroughly investigated.
Although managing her glucose levels is very important, please be cautious; forcing sugar water into her mouth carries a risk of aspiration (inhaling the liquid into the lungs). If Paisley is conscious and able to swallow normally, the recommendation is to place a small amount of an appropriate glucose source, like the water you mentioned, directly onto her gums or inside her cheek, where it can be absorbed through the mucous membranes. This can help raise her glucose levels without the risk of aspiration. However, if she becomes extremely weak, cannot swallow normally, collapses, becomes unconscious, or has a seizure, nothing should be given by mouth because of the risk of inhaling it into the lungs. Those situations require immediate emergency veterinary treatment.
Because Paisley has gone this long without eating voluntarily and continues to experience low blood glucose, I would discuss referral to a veterinary internal medicine specialist or hospitalization for nutritional and glucose support. Think of the glucose as a power generator keeping the lights on, but the priority is still finding out why the electrical system keeps failing. Sugar can keep the lights on for a while, but eventually we need to find the faulty wiring. Supporting her blood glucose is essential, but identifying and treating the underlying cause is what will ultimately allow her to maintain normal glucose without constant intervention.
I wish you and Paisley the very best, and I hope this helps.
- Dr. Paola
This article is a part of our weekly Ask Dr. Paola series
Expert dog care, straight to your inbox
News, insights, expert advice, and everything dog.
No spam — unsubscribe anytime.
By signing up, you agree to our Terms & Conditions and Privacy & Cookies Policy.
How useful was this post?
Click a star to rate. You can leave written feedback afterwards. (We read all feedback.)
Dr. Paola Cuevas is our Senior In-House Veterinarian at Dogster and Pangolia. She has over 19 years of experience working with an array of species and loves sharing her knowledge and experience with our readers and aims to provide assistance with any issue presented by your non-human family members. She received her degree from the University of Guadalajara, Mexico.
Her passions are animal welfare and preventive medicine, and has skills in the fields of nutrition, microscopy, clinical pathology, diagnostic imaging, and endoscopy. Paola frequently contributes pet care insight to various media outlets like PetMD, The Daily Record, Parents.com, etc.
Paola is also an animal behaviorist with extensive experience in positive reinforcement animal training.
