aggression in 5 month old boxer mix - Page 2

put him down

I can't really say I have ever seen a puppy at that age act viciously towards a child with serious intent of biting. If the child was or wasn't acting hyper , this is not good. The dog should of never been adopted with this problem. Not sure what caused it or if this could ever be fixed.
I think either take it back and let someone know how serious the problem is or uthanize the dog. I don't know it is a guessing game to why the dog is doing it , could be unsocialization, fear, aggression, the dog is sick.? not sure.
But, take aggression towards children serious. It is a huge liability and they wouldn't want to be under constant worry the dog will bite a toddler.
  good luck.

You don't need a vet to put a dog down. 

True, but in most localities, that'd be a crime.  I don't think I'd be comfortable encouraging someone to commit a crime via public forum.

Second-hand description, and a very young dog 5 months old!  It can be worked with and trained.  It's obviously never seen a baby before and is probably very curious and exited by the way the child walks around.  They should do obedience training and go from there.  Only a trainer can evaluate this behavior, owners often mis-read things.

Just as Ruger1 and Doberdoodle say - an experienced trainer can easily evaluate the puppy and advice pup´s owners what to do,after a few sessions he/she will also see whether the owners are able handle the pup or not.
I myself have a female Hessy Stastena who is a dominant and tough dog with very strong drives.When she was a puppy she also behaved like crazy when she saw my  brother who was 11 at that time.If somebody unexperienced saw her behaving like that,they would also say she was dangerous or agressive which she wasn´t at all.She wanted to play with him in her own wild way and to hunt him  which, of course, she wasn´t allowed.As she had more training she learned what is o.k. and what´s not. She is great with children and especially likes our 18 months old son.

bump

Put it down so we don't all have to read the "pit bull mauls baby" headline in a bit.  Because, if they are calling it a "boxer mix" bnow, believe me, it WILL be a "pit bull" when it bites. Notice I said WHEN.

I recently put down one of my beautiful, wonderful, homebred pups at 6 months. She repeatedly tried to get at a 22 month old baby who was absolutely still. I tested her two littermates and they were soft and lovable with the child in the same circumstance.

Sure,some will think me a beast for sobbing as I held my hombred, high-hopes, much loved pup and put her down.  Go ahead. Her aggression was NOT caused by anything but some genetic miswire, as her upbringing was identical to the other syblings.  WHY let her tarnish the breed then?  Why put children at risk?  I just don't believe this desire to keep  unsound dogs alive is helping dogs in general, AT ALL!   

Why put children at risk? I just don't believe this desire to keep unsound dogs alive is helping dogs in general, AT ALL!

I agree completely. The unending excuses for an unstable dog are ridiculous.