Nancy Carlson 
Loudmouth George and the New Neighbors, 2nd Edition [PDF ebook] 

When a family of pigs moves in next door, George wants nothing to do with them. "Pigs are dirty, " he claims. "They eat garbage. They’re not like us at all." George’s friends, however, don’t share his concerns. For the next few days they have a ball in Louanne Pig’s backyard while George sits indoors. But on Wednesday when he hears them shrieking with laughter as the run through Louanne’s sprinkler all morning long, it’s too much for him. Maybe pigs aren’t so bad after all.