Which of the following methods is NOT recommended for cooling a rabbit?

Restricting food intake is not a recommended method for cooling a rabbit because it can lead to serious health issues. Rabbits rely on a continuous supply of fresh hay and pellets for their digestive health, and depriving them of food can disrupt their digestive system, leading to complications such as gastrointestinal stasis. Additionally, a rabbit's body temperature can be affected not just by external factors, but also by its hydration and nutritional status. Ensuring that a rabbit has access to enough food and water is essential for overall well-being, especially during hot weather.

In contrast, the other methods described are more appropriate for helping to regulate a rabbit's temperature. For example, using frozen water bottles can provide a cool surface for the rabbit to lie against, helping to lower its body temperature. Similarly, employing a fan can create airflow, which assists in dissipating heat and promoting comfort. Placing wet socks on a rabbit's ears may have some cooling effect due to the ears being highly vascularized and their ability to regulate temperature. Thus, restricting food intake stands out as detrimental rather than beneficial for a rabbit's health during hot conditions.