We have two dogs got Tank to give Sam a buddy, now Sam is acting strange!

I wont shoot Sam if I were you. He is a medium size dog. Just whack Sam with a broom but don't kill him. Your dog is acting strange since there is a new dog in the house. Sam thought you trusted him . He felt he was the protector of the house. Your house was his territory. Ever since Tank came around, Sam felt betrayed.He also felt insecure. Just give Sam special attention. He'll come around. My dog was like that. When she was our only dog, she was so playful. But after she gave birth to puppies, she distanced herself to us. After 8 years when she is again our only dog, she was the same dog again when we adopted her. I really pitied her and felt guilty about it. So just separate those two dogs.

If I were you I would never beat him. He is acting like that just because of what you said.. he was spoiled since the beginning. He is acting like that because he is jealous. Probably when you got the other dog you might have been more kind with Tank and not Sam, so Tank could fit in. You might not even realized that, but it probably happened. You should be more kind to Sam, so he could see that you and your husband still love him, if you are mean or saying bad things even in a bad tone, he might get angry with you two. Be kind, giving him lots and lots of love. When he is sitting or lying down, call for him, let him come to you and then give him lots of affection and love. He might have an depression, it happens on dogs more times than we think of, it happens when the dogs think that their owners don't love them anymore or if the owners get a new dog, they think that they are now a second choice in the "favorite animal". My dog is kind, lots and lots spoiled, she is tender, she loves to meet other people, but sometimes i'm affraid she could bite me too, it could happen. They are dogs, they have survival instinct. Give Sam a break, you got another animal.. Imagine that you were in a family and you were the only daughter, imagine living like that for years,you recieved love, toys, everything... and then your parents bring another child to your home. You have two options, or you are kind to the new children, playing, being friends etc etc or you think it's stealing your place. In humans is easy to choose, and sometimes they are children that don't like that, but they have no other option than accept and became friends in time. You need to respect Sam, he is dealing with himself right now, he thinks your love vanished, and now you seen to care more about Tank. I might be wrong, maybe he is just declaring is territory, but I think he misses the love you gave him. I think it's hard to deal with it, and it may take long time, really long time. But you need to stay strong. Be kind with the two of them, but give more affection to Sam, he needs it. Then with time, give them the same affection. It needs to be done patiently, quietly. When he does a good thing, give lots of affection, when he does something bad, don't give him. I feel bad about Sam actually, it must be hard. So please, don't do anything for now.