The obese surcharge is not based on the weight we see on the scale, charges related to that are mentioned above in regards to the scheduled weight and over 80lbs weight. The Obese Surcharge is regarding the fatty build up we see within your pet, surrounding the reproductive organs. This is typically based on the Body Composition Scale, addressing the level of fatty build up per individual animal compared to that animal's lean body mass.
Sometimes this can be seen from the outside, in extreme cases. But typically, we see this during surgery as build up around organs. This build up increases the risk during surgery as well as increasing the time that it can take per surgery, which is why there is an additional fee of $30 for dogs and $20 for cats. This fee is mostly seen in female patients, with a few male cryptorchid patients being that exception.