1. Greg's Reluctance to Attend Rowley's Birthday Party:
- Greg is invited to his best friend Rowley's birthday party, but he is reluctant to go because he is worried about being embarrassed.
- He tries to avoid attending by making various excuses, but eventually ends up going.
- At the party, Greg feels uncomfortable and out of place, as the other kids are younger and interested in different activities.
2. Greg's Attempts to Avoid Chores:
- Greg's parents assign him various chores to do during the summer, but he tries to find ways to avoid them.
- He pretends to be sick, enlists the help of Rowley, and even considers running away to escape doing his chores.
- His parents catch on to his schemes, and he eventually has to complete the chores.
3. The Appearance of Sweetie the Dog:
- Greg's family decides to get a dog, which Greg initially opposes due to his allergies and fear of dogs.
- The dog, named Sweetie, causes chaos and destruction in the house, much to Greg's annoyance.
- He tries to get rid of Sweetie but fails, and eventually learns to live with her presence.
4. Greg's Rivalry with Bryce Loski:
- Greg's younger brother, Manny, becomes friends with Bryce Loski, a bully who lives in their neighborhood.
- Bryce starts picking on Greg, leading to a rivalry between them.
- Greg tries to one-up Bryce in various ways, but his attempts often backfire and end in embarrassment.
5. The Misadventures at the Country Club:
- Greg's family joins a country club for the summer, and he is excited about the opportunity to swim and play tennis.
- However, he encounters various mishaps and humiliations at the country club, such as getting lost in the woods, being chased by bees, and falling into the pool with his clothes on.
Overall, the conflict in Diary of a Wimpy Kid: Dog Days revolves around Greg's struggles to navigate the challenges of summer vacation, including avoiding chores, dealing with an unwanted dog, facing a bully, and experiencing embarrassing moments.