If you scoop the grease off of your grill and toss it aside, it could be an irresistible temptation and the result could be a pet with an irritated pancreas. Fatty foods and pure grease are often irresistible to pets, but the fat overdose can trigger a life-threatening inflammatory condition called pancreatitis. Be sure to store lighter fluid and grill cleaners away from pets, too. Or better yet, adopt the techniques in The Best Way to Clean Your Grill.
If you use lighter fluid, keep it far away from pets. The ASPCA notes it could trigger skin irritation or, if ingested, digestive system irritation and central nervous system damage. Inhaling lighter fluid can cause aspirational pneumonia and breathing problems. (Yeah, maybe just skip the lighter fluid altogether.) Matches should be stowed away from pets and properly discarded after you use them, too. Some contain chlorates, potential blood cell damagers, says the ASPCA.
More: The Ultimate Guide to Healthy Grilling