Unless there's an extreme situation revealing an unhealthy dependency on your dog—like consistently canceling plans with human friends and family to prioritize your pet—it's unlikely to love your dog excessively.
However, it's entirely possible to unintentionally harm your dog due to misguided affection or misunderstanding their needs.
Examples include:

• Overfeeding your pet with excessive treats and dog food.
• Offering an unhealthy diet composed of high-calorie human food.
• Showering them with excessive physical attention—some dogs may not enjoy as much cuddling as we expect.