Can I Give My Dog sterile saline?

Yes, with care
Saline wound flush is commonly referenced for dogs at published doses. Published guidance for dogs: flush liberally, as needed. The correct wound cleaner. Anything deeper than a scrape, punctures, or bite wounds: vet same day (bites infect at high rates).
Source: Veterinary Partner (VIN)
Get the exact range for your dog's weight

The safe habit

Confirm any medication decision with your veterinarian, who knows your dog's health history and other medications. VetDose shows published reference data, not prescriptions.