Oh my Buddy is sooooo cute and DeeOhJee is too! Georgie's BFF and sister was a 75lb Boxer and they loved each other to pieces

Coco was the sweetest girl ever! I would also recommend a harness. I know you said your Mom bought him a collar but the harness is much safer so you don't pull on his little neck muscles. We had Coco (our Boxer) for 6 years before Georgie came along and always used a collar but with Georgie we got a harness and it worked better and was safer.
I look forward to more pictures of Buddy and DeeOhJee