Lilly, Bill and Willy

Lilly

 * she is a pembroke welsh corgi
 * she likes chasing Jo
 * she wears a blue collar

Billy

 * he is a black dachshund
 * he follows Lilly
 * he wears a red collar

Willy

 * he is a brown dachshund
 * he follows Billy
 * he wars a yellow collar

trivia

 * they are fast