While all rabbits have some degree of heat tolerance, certain breeds are known to handle heat better than others. Here are a few rabbit breeds that are generally considered to be more heat-tolerant:

1. American Chinchilla: This breed has a dense, short coat that helps to regulate body temperature in both hot and cold climates.

2. Californian: Californian rabbits have short, white fur with black points, which helps reflect sunlight and keep them cool.

3. Champagne D'Argent: With their dense, silver-gray fur, Champagne D'Argent rabbits have good insulation properties that help them adapt to various climates.

4. American Sable: The American Sable breed has a medium-length coat that provides some insulation but is not excessively thick, making them more comfortable in warmer temperatures.

5. Standard Rex: Rex rabbits have a unique fur texture that is denser and shorter than most breeds. This characteristic allows for better airflow and heat dissipation.

Keep in mind that even heat-tolerant breeds still require proper care and attention during hot weather. Providing shade, ventilation, fresh water, and cooling options such as frozen water bottles or ceramic tiles can help rabbits of any breed cope with high temperatures. Regular monitoring of their well-being and taking appropriate steps to prevent heat stress or heat stroke is crucial.