Yes, it is safe to give both Grizzly Joint Aid *and* Grizzly Salmon Oil supplements to your dog, as long as you are following the recommended dosing shown on each label. 

Both labels recommend the dose be given once a day, however some customers have divided the dose in half, giving half dose in the morning, and half dose in the evening, to spread out the quantity.

Either way, you want to make sure to never exceed the recommending dosing amounts on each product label.