The rubber curry comb brush is good for "shedding". My dog shed twice a year usually. For moist smooth coated chihuahuas it i not a huge deal but I think the "double coat" chi-s have an undercoat as well, there is a lot of fur. In the US a long coat and a short coat can be bred so in US a lot of KC chi-s have the genes of both. Rico has both in his pedigree. I think there were some LC in his litter too...
Rubia -y mi perrito que Rico