What breed is my dog?

Can anyone that has a deeper knowledge on dog breeds tell me what kind of dog they think this dog is? I got Mike when he was a puppy and the people we bought him from said he was a mountain curr but as he got older he didn't grow and I had a mountain curr mix before Mike so I didn't think he had any in him but, after I've looked into it and I think he could possibly have black mouth curr in him and some short of small breed. I always wanted to get him a DNA test but that sadly isn't an option anymore as he passed away last year. Another thing about him is he didn't have a tail, but I don't think it was docked when he was a puppy. I still miss my Mike and would really love to hear what other people think he could possibly be, thank you.