Previously Abused Dog Submissiveness Issues
I have a 6 year old beagle/basset mix we adopted from a local rescue group. We guess that he was subjected to frequent beatings before he was dumped for the rescue to care for. Mind you, he is an excellent dog, very intelligent, food motivated (will do anything for a treat), and is excellent to have around. We have had no issues with aggressiveness, rather, we have issues with excessive submissiveness. We believe these things have stemmed from his past issues with being beaten/mistreated/abused.
I am having a very difficult time with training him, issues that I have never dealt with before. He sits on command now (only occasionally needing a hand signal reminder). Laying down has been our biggest issue. He won't lay down properly, however, he rolls over onto his side, raising his leg in a submissive posture. No matter how sweet and positive you are, he still persists in such behavior.
Another issue I am having is that any form of correction sends him flying, tail-tucked, to hide under the nearest bed. If we catch him sneaking into the garbage cans to steal used feminine sanitary products (which he then stashes under the beds to chew on later), and we tell him "NO" in a firm voice, he yelps and screeches all the way to hide anywhere he can.
Does anyone have any tips for training dogs such as this who are still having issues that stem from his previous treatment? By the way, his photo is my avatar if you were wondering