Methods, systems, and devices for adjusting an animal wearable devices are provided in accordance with various embodiments. For example, some embodiments include a system that may include an animal wearable device, one or more straps, and one or more strap length adjustment mechanisms coupled with the one or more straps; the one or more strap length adjustment mechanisms that may be coupled with the animal wearable device. The strap length adjustment mechanism may include a variety of components such as a take-up spool and tension component(s). Some embodiments may utilize a motor coupled with the take-up spool and a microcontroller. Some embodiments include methods of utilizing the strap length adjustment mechanism(s) to adjust the fit of the animal wearable device.