Our coop is almost done and I'm thinking about putting up solar electric fencing around it to keep my 110lb lab (chicken killer) from trying to attack the coop/run when I'm away. Question is - how do I know if an electric fence is strong enough to deter the 110lb lab and not kill my other two small dogs (5 lb and 15lb)? I'm looking at purchasing the solar electric fence from home depot (I think it's Red Snap'R). Thank you! Dawn.