Hi, any experienced help on this problem would be greatly appreciated! I just sold my 9 month old male puppy (intact). He is sensitive, loving and regularly socialized in public places on leash; also gets pet by strangers if he chooses (I let them put their hand out & he will come up or not, I do not force him). He had no agression towards people but got overly excited and unsure around certain dogs (not every dog). He is crate trained and trained in obedience by myself only. He listens good & follows commands from my husband and 5 year old child for regular tasks like going in & out of the house, recall and following them around our property as well as getting affection. He has a high drive, good focus with me (his trainer) and not dominant in my dog pack of 5 dogs. The new owners spent time with me (about 1.5 hrs) & him before deciding on purchasing him, then spent 4.5 hours with him in their car without a crate and he seemed comfortable, they arrived home and walked him around their property. (A short video of him walking at their property showed him walking and sniffing then getting a tug of the slip lead leash from the new owner wanting him to come to her; he looked a little scared at that point but not engaging with her ). Then after being in their home for a little while he started to jump on their back when faced away and bite. Before they decided to take him home, I told them that he sleeps in a crate and needs a crate to relax and feel comfortable in his safe place. They told me they had a crate, so I assumed they were going to use it knowing from the info I told him that he needs to have a crate to feel safe and relax in. After they notify me that he jumped and bit them I said he needs to be in the crate for the night and they told me they had one years ago and only used it a few times. I’m sure the pup is having some separation anxiety, lack of trust with new owners and stressed from not given anytime to relax and settle into his new environment among other things. What would you recommend in this situation? Do you think having an IPO trainer (experienced in correcting behaviors & training puppies) meet with them would be beneficial verses taking him back? Do you think this experience would traumatize him and cause issues rehoming him in the near future? He just turned 9 months old. Thank you for your advice!