Dude, the people saying use rat poison are fucking morons!! rat poison is an Extremely painful death, and WILL NOT kill the animal instantly it could take up to 3 hours and the animal would be in excruciating pain the entire time. plus rat poison is an obvious death you have to be more discrete the owner of the animal will have plenty of time to go to a vet and find out the cause, which could get you Jail time. The SMARTEST most SIMPLE way is to either get sleeping pills, very humane the animal will simply fall asleep and drift into a peaceful death. OR their are certain Plants such as flowers and leaves that are toxic that will poison the dog, just coat the leaves with beef grease or something of that origin to make it smell good to them and leave it out by the dog, No one can hold you responsible for it if they decide you wanted the dog dead. it is a Full proof plan

btw:if you use pills.. check the label to see the dosage, if you don't give the dog enough it might just make him sick. MAKE sure its a sleeping pill or if it says side effects may cause *drowsiness* thats what to look for. DONT use a drug called *melatonin it is considered a sleeping pill but it will cause the dog to just start seizing out and vomiting and it will be a LONG death very cruel. & you can google toxic plants online to get the names of them, their very cheap and you can fid them Anywhere you might already have them in your yard, toxic plants are VERY common a matter of fact their are few plants that Aren't toxic majority are deadly. Depending on the dogs weight and size is how much it needs to eat, if its a large dog it will have o eat ALOT of the plants, so if its big animal just go with sticking a shit ton of sleeping pills in a wad of meat and feeding it to the animal... just make sure their are NO witnesses or you'll have to take them out too.. and its allot more difficult to poison a human without leaving a trace, you might just have to Hire a russian assassin.. but lets not get ahead of our selves, worry about the assassin later on if they become suspicious. another way is to drop a few drops of Rohypnol (the date rape drug) in the animals water. that is THE BEST OPTION its nearly untraceable in animals and will work fast and easy, With NO side effects such as vomiting,seizers,hives,sickness etc. Hope it all goes well with out a hitch... I was never here

good luck and please don't Be cruel to animals.