I think my dog is a miniature beagle!?

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We have had a beagle for almost a month now, and she doesn't really seem to be growing at all. I mean when we got our rottweiler he grew pretty fast. I'm not sure whether it is because she is a smaller breed of dog or whether she might be a miniature beagle. The vet hasn't said anything, but she hasn't seen candy since her first shots. Candi eats and everything, and seem healthy. She is gaining weight, but not inches. The strange thing was that I looked a site for miniature beagles and the first picture that popped up was her pretty much. It looked identical to her. Does anyone know whether smaller breeds grow at a smaller pace? Has anyone ever heard of a miniature beagle? Thanks for any input.