at my wits end with our dog

EDIT: since people want to put their own words in my post let me clear things up. i AM NOT giving up on him... i AM not going to just take him an drop him off somewhere or give him away. i LOVE him to death if it wasn't for me amd my fiance hed be dead from abusive neglectful owners. we fought like hell for a year trying to get him from his previous owners even had to call aspca on them for killing 9 animals in less than a year because they leave them outside in the heat snow rain etc 24/7 with no shelter and half the time no food or water and ran two of them over. before he was actually ours i was buying him collars clothes food toys beds huge expensive things paid money to take him to the vet when he was sick because they wouldnt! bought him 70$ seresto collars for flea infestation because THEY wouldnt. would sit in the bathroom floor after bathing him for hours with a flea comb and individually pick EVERY dead flea off his body after they came and took him back multiple times when he would come to our house to get away because their dogs are all eat up with fleas...but im SOOO IRRESPONSIBLE... right..... JUST because im sick of him acting the way he is DOES NOT mean im not going to continue to love him and take care of him... )))))) we have a long haired chihuahua/papillon mix. i love him to death but I'm getting to where i can't stand his new habits. every since we brought our son home 8 weeks ago he has peed in the house MULTIPLE times a day especially around the baby's things. pooped any time he gets the chance in the house. no matter how many times we let him go outside. he has destroyed TWO sets of blinds and has started getting in the trash and dragging trash out everywhere. I'm so sick and tired of it. I've tried everything. were about to start putting him in a kennel at night and when we have to leave through the day because that's when he does it. we've already had to ban him from our bedroom until bedtime because when we are in the living room he'll go in our bedroom and pee wherever he wants when were not looking. one morning while we were gone i came back and got back into bed and he had peed IN OUR BED!. i absolutely CANNOT stand for my house to smell like dog urine. he's house trained and he needs to quit being dominant over the baby, especially when he still gets attention and love. i dont want to put him in a kennel thats why i havent already i don't like them i just dont know what else to do.