I used these as readers for my late 1st grader/early 2nd grader. I love how many series Cynthia Rylant has done on different reading levels, and Mr. Putter and Tabby were as fun as the others we have used. I have found that my children learn to read better when they love the characters, and they always love Cynthia Rylant's characters. In these books, the characters are cautious Mr. Putter, his very sanguine neighbor Mrs. Teaberry, and their pets, which suit them each perfectly. Each story is gentle and fun. Mr. Putter grits his teeth and goes with Mrs. Teaberry's newest wild scheme, her dog Zeke is crazy, his cat Tabby wants to rest, and Mrs. Teaberry bakes him wonderful goodies. They are kind to each other, and he reminisces about boyhood days... really sweet stories. My son told me when we were going through all of these that reading was his favorite time of day.
If you haven't delved into Cynthia Rylant's many series for many reading levels, you can do a google search to figure out which one might work best for where your child's skill level is.