Are Bulldogs diggers?

So I'm cutting the grass yesterday. Cut the front then go to the back. I'm about 3-4 passes into cutting it and I hear my dog barking like crazy. There's a huge white bulldog at the back of my yard. My gates both have locks on them so he didn't come in that way. I walk over to my neighbors and ask him if he knows who it belongs to since his backyard butts up to 3 others. He said he thinks it is the house down near the corner. I walk over and no one is home. I get back and can't find the bulldog anymore. It was fading light and I wanted to get done before the 6:30 football games. Search the yard again and don't see him after I finish. I went out today and searched every part of my fence and don't see any spots that have gaps at the bottom. There was one spot where the dirt was kicked up but didn't seem large enough for a dog his size to get under. Maybe if he was pushing the fence might have pushed out of the way enough. Still can't figure out how he got in or got back out. My dogs are small and could have gotten through there if on their belly but they usually just dig holes and not under stuff. Do any of yall have Bulldogs? Do they dig like that or push under chain link fencing?