Chicken, Pig, Cow Horse Around by Ruth Ohi

From chapters.ca:
Chicken, Pig and Cow are very happy together in their barn, so not everyone is pleased when Horse arrives. Horse is clever and strong, but, as Chicken points out, he also takes up a lot of space. The adorable toy characters Chicken, Pig and Cow (and real-life Dog) continue to delight young children with their charming adventures and subtle messages about friendship, acceptance and working together.