My 2-year-old cat is still kitten-sized. What could be wrong?

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! She could have a congenital issue like dwarfism or be a certain breed like a munchkin. There are genetic endocrine issues like hypothyroidism that can stunt growth but that is exceeding rare. It’s hard to say if it will affect her life span without knowing if her stunted growth is from a medical condition. Next time you take her to the Vet have them look in to it. I wish you the best!

Kameo is adorable! She may not get much bigger if she has not grown much in the past 6 months. This is not normal per se for cats, but may be common for runts of the litter. Nutrition may help with this as well as ruling out any underlying medical conditions heart, liver, kidney issues through a throrough physical examination by a veterinarian + screening bloodwork. A top rated food that I recommend for a cat of this age is Royal Canin Kitten dry and wet food. It is highly palatable (most cats love the taste) and provides better nutrition than many other commercially available brands of cat food. I recommend transitioning gradually over the course of a week into the Royal Canin Kitten diet (1st 2 days 75% old food 25% new, 2nd 2 days 50%/50% old/new and last 2-3 days 25% old/75% new). You will likely notice an improvement in Kameo's coat and skin health on the Royal canin diet. If she does not grow significantly by the time she is a year of age....continue her on the Royal canin adult cat food, maintain her at a good body condition score (not too far or too thin), and give her lots of love! Kittens like people come in all shapes and sizes!

She doesn't seem very small to me from looking at the pictures, but pictures can be misleading, so I'd have to see her in-person to really tell. Stunted growth essentially happens for four different reasons: 1) Hormone deficiency - would be a very small cat (almost kitten-sized). 2) Genetics 3) Disease - such a liver shunt, or high parasite load 4) Lack of proper nutrition at a young age In the pictures, Diamond Nilo appears to be well proportioned, has a good coat and is generally not sickly appearing. This information actually goes a long way to saying that it's likely just genetics -- she is just a smaller breed. If she had any of the other conditions, then it would be more obvious by now, because she would have deformities, or continually showing signs of illness. Without knowing her whole history, it's difficult to know how healthy she is, but if you are not noticing any other problems with her, then I would not worry about getting bad news at the vet's office. I hope that helps and all is well with Diamond Nilo.

If Silver is almost three years old now, she should be completely finished growing - so I would not expect her to get any bigger. Some cats do stay very petite in size; this isn't necessarily abnormal, as long as she seems healthy otherwise. If she is eating and drinking fine, active, and not overly skinny then I wouldn't worry - she may just be a small kitty :)

Poor Shadow! This could just be her normal. Cats can actually have multiple dads from the same litter so it is possible that her dad was a more petite cat. There is also the possibility that she has a genetic issue that prevents her from growing normally like poor absorption of nutrients or a liver shunt. If she is completely normal, then I wouldn’t be overly concerned. If you are concerned or if she doesn’t act like the others, then I would talk to your vet. Your vet can do some blood work, fecal and possibly even X-rays, an ultrasound and specific GI bloodwork if needed to see what could be causing the poor growth. I hope this helps!

Hi and thanks for posting on Petco Pet Education Center, formerly Petcoach! Lack of growth and failure to gain weight in a kitten can be due to a number of medical causes- viral or bacterial infections and parasitic infections could be potential causes among others. I would recommend having the kitten seen by a veterinarian for an exam and assessment. You may wish to bring a fresh fecal sample to the vet appointment in case your vet wants to test the kitten's stool. I hope this helps and thanks for using Petco Pet Education Center, formerly Petcoach!

Some cats can have a smaller frame than an average size cat and still be completely healthy. Other causes of being smaller than other cats could include congenital malformations, decreased nutrition, intestinal parasites, or other medical illness. Without a medical examination, we won't be able to tell you whether you should be worried or not. When you get the availability, I would have her looked at by a vet.