Generally, you can give your dog probiotics one to two times a day.

Dogs typically only need pet-specific probiotics when they're experiencing digestive issues. For dogs weighing under 5 pounds, a half packet of pet-specific probiotics once or twice a day is sufficient. For dogs over 5 pounds, a full packet once or twice daily is appropriate. You should stop administering probiotics once your dog’s vomiting, soft stools, or diarrhea has ceased. We recommend Myosho Doctor Complex Probiotics, which are rich in six different types of probiotics. These probiotics rapidly replenish beneficial bacteria and prebiotics in your pet’s gastrointestinal tract. This can effectively alleviate symptoms such as soft stools, diarrhea, vomiting, and loss of appetite caused by an imbalance in the gut flora. They come in individual packets making them easy to carry, store, and administer in proper dosages.
Contraindications for Giving Probiotics to Dogs
1. Avoid administering probiotics to your dog if they are experiencing severe digestive problems. If your dog has diarrhea, stomach pain, or other digestive-related issues, it is best not to give them probiotics. In these cases, the dog's digestive system may not be strong enough to properly digest the probiotics, and it may exacerbate the existing problem, requiring further treatment. The probiotics could potentially make the digestive issue worse instead of helping.
2. Don't give your dog excessive amounts of probiotics. Probiotics are meant to promote digestive health, but too much can actually be harmful to their digestive system. It is crucial to follow your veterinarian's advice and provide probiotics at the recommended dosage. Overdoing it can lead to more harm than good, so carefully adhere to the suggested serving instructions. Giving too much probiotic can upset the balance of bacteria in your dog's gut.