<Table> Chihuahua <Tr> <Td_colspan="2"> A purebred Chihuahua showing the classic features of the breed </Td> </Tr> <Tr> <Th> Other names </Th> <Td> Chihuahua </Td> </Tr> <Tr> <Th> Origin </Th> <Td> Mexico </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Th_colspan="4"> (hide) Traits </Th> </Tr> <Tr> <Th> Weight </Th> <Td> Male </Td> <Td> 1.8--2.7 kg (4--6 lb) </Td> </Tr> <Tr> <Th> </Th> <Td> Female </Td> <Td> 1.8--2.7 kg (4--6 lb) </Td> </Tr> <Tr> <Th> Height </Th> <Td> Male </Td> <Td> 15--25 cm (6--10 in) </Td> </Tr> <Tr> <Th> </Th> <Td> Female </Td> <Td> 15--25 cm (6--10 in) </Td> </Tr> <Tr> <Th> Coat </Th> <Td_colspan="3"> Short - haired (smooth coat) and long - coat </Td> </Tr> <Tr> <Th> Color </Th> <Td_colspan="3"> white, black, tan and many other colors </Td> </Tr> <Tr> <Th> Litter size </Th> <Td_colspan="3"> usually 2--5 </Td> </Tr> <Tr> <Th> Life span </Th> <Td_colspan="3"> 12--20 years </Td> </Tr> </Table> </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Th_colspan="4"> (hide) Classification / standards </Th> </Tr> <Tr> <Th> FCI </Th> <Td> Group 9, Section 6 Chihuahua #218 </Td> <Td> standard </Td> </Tr> <Tr> <Th> AKC </Th> <Td> Toy dog </Td> <Td> standard </Td> </Tr> <Tr> <Th> ANKC </Th> <Td> Group 1 (Toys) </Td> <Td> (Smooth Stds Long standard) </Td> </Tr> <Tr> <Th> CKC </Th> <Td> Group 5 - Toys </Td> <Td> standard </Td> </Tr> <Tr> <Th> KC (UK) </Th> <Td> Toy </Td> <Td> (Smooth Stds Long standard) </Td> </Tr> <Tr> <Th> NZKC </Th> <Td> Toy </Td> <Td> (Smooth Stds Long standard) </Td> </Tr> <Tr> <Th> UKC </Th> <Td> Companion Breeds </Td> <Td> standard </Td> </Tr> </Table> </Td> </Tr> <Tr> <Td_colspan="2"> Domestic dog (Canis lupus familiaris) </Td> </Tr> </Table> <Tr> <Td_colspan="2"> A purebred Chihuahua showing the classic features of the breed </Td> </Tr>

What is the average litter size for a chihuahua