Good dog goes bad.
MY GSD male will be 9 mos old in 2 wks. He received his Canine Good Citizen at 5 1/2 months on his first try. I have worked with a trainer since I got him at 10 wks. He is the calmest dog when out of the house vet,doggie daycare once a week, park etc, when he's home with our 3 yr old female (spayed) Jack Russell and my husband,he is non stop jumping playing aggressive just over all bad!I plan to neuter but want to hold off a while but I am second guessing myself and I am under pressure from spouse. Please I need input I want what's best for my dog. He is a big shepherd he is at 81 lbs and very big boned and yes I have had him on large breed puppy and very careful about feeding vet says he is just a BIG shepherd. his pedigree is sire is AKC show and Mom is east european working dog think may be some of the cause of behavior. He is a great dog and I try to work him out and planned to start him in Rally the first of year. Anyone experience this ?