Here's what you should consider:
* Breed Standard: Border Collies have a range of acceptable sizes within their breed standard. Look at the breed standard for your pup's lineage to see what's considered typical.
* Genetics: Just like humans, dogs inherit their size from their parents. If one or both of her parents were smaller than average, it's more likely she will be, too.
* Nutrition: Adequate nutrition is crucial for healthy puppy growth. Make sure she's eating a high-quality puppy food and getting the right amount for her size.
* Health: Occasionally, health issues can affect growth. If you're concerned, consult your veterinarian. They can examine your puppy, check her weight and growth curve, and rule out any medical concerns.
What to do:
1. Talk to your vet: Your veterinarian can assess your puppy's growth and health. They can help you determine if her size is within the normal range for her age and breed.
2. Monitor her growth: Keep track of her weight and measurements over time. You can use a growth chart specifically designed for Border Collies to track her progress.
3. Provide good nutrition: Ensure your pup is getting the right amount of high-quality puppy food to support healthy growth.
4. Stay patient: Even if your pup is on the smaller side now, she may still have a growth spurt later on.
Remember, every dog is unique, and it's important to focus on her overall health and well-being, not just her size.