
Cher's first season was 7 weeks. She got a bit lathargic, and anemic (sp?) . Her breeding day, during that heat was like day 45 or something ridulous like that.
Add some high protein food, and also a multivitamin to help nutrients and vitamin stability. Thats what the vet told me to do.
Her seasons after that, went back to the "normal" 3 week length.