I had same deal years ago,I got this half bluetick half doberman pup,[male doberman got in the barn with a female bluetick,both purebreds,and nobody than wanted the pups],I called it a doetick,heck of a dog,big,no tail,blue on his chest and legs,ears wern't docked.
When he was about half grown my nieghbor was putting up hay next to us and his two big collie type dogs chewed my doetick up pretty good,I didn't say a word to my neighbor,well,might half been a couple years later,doetick is now able to kill a big ground hog with one shake,same thing,neighbor cutting hay with his now older dogs,my doetick had a fine time with them,they was running for their lives after awhile,neighbor didn't say a word either. It was a dog thing only.