Bulldogs World

Yesterday, she didn't come out of her room when the kids came, I heard her bark after awhile, and she was just standing by her bed as if she was hooked on something. She was moving her front legs, but couldn't seem to get momentum in her hind legs. I got the leash, and after awhile she seemed ok, but more subdued that usual. She still jumps up on furniture and doesn't seem to be in pain. Eating well also. A few moments ago, she did the same thing. She was barking from the other room, and when I went back it was the same scenario. After a couple of moments, it was as if the breaks were released on her back legs, and she trotted in normally. 
I'm taking her to the vet on Monday, but curious to know if anyone has ever experienced this with their bullies. She doesn't seem to have any soreness at all when I massage her hind parts. 
Thanks for any info.