To big to swallow whole. Only his favorite dog treat offered up a foot away got him to drop it, and go for thereat. I got to throw it in the trash can the day before it was picked up. Our female dachshund got one but disposed of it the all natural way for us.
When he goes on ALERT around the storage building or the koi pond area I know to bait the traps. With technology, thumbs & peanut butter I am slightly ahead of the dogs in the rodent count. Kill em all, death and destruction shall reign down upon the Rodentia of all manner. OK, we don't have beavers and other larger Rodentia, mostly mice and a few rats.