Pet Friendley Products

I just discovered the wonderful and therapeutic world of gardening. As of just a couple of weeks ago I have begun digging up my backyard and redesigning the look. My first project was planting monkey grass along my back fence line to make it feel more enclosed. I trimmed and mulched my trees as well. The next step is concerning the weed problem and fertilizing the grass. My question is, is there any pet friendly products out there that I can use with two active dogs that love the grass? My vet told me to look for products that say "pet friendly" but I can not find any. Please help!