Remote Training Collar for aggressive puppy?

I have a 10 month old beagle/spaniel mix puppy. She has been aggressive since I first adopted her from the shelter at 8 weeks old. She only bites me when I put her in her crate before work or hold onto her collar to prevent her from jumping on guests. I put my dog through Obedience Training for 8 weeks (they used clicker training-all positivie reinforcement). She learned new tricks but her behavior continued to worsen. She has recently begun trying to bite men that come into our house (Fed Ex guy, insurance man, etc.). She growls aggressively at them, nips at their pant legs, backs off, and starts all over again.Last night I had a professional Dog Trainer (been in the business over 15 years) do an evaluation. He believes that my dog is a real potential problem. He suggested using a remote training collar and doing an extensive 7 week one-on-one training with her. This will cost $800 for the whole program.
Does anyone have any experience with using shock collars on Aggressive Dogs?

I just cannot believe some of the answers to this question on this list. Some of them are just unbelievable. I am appalled any one should suggest a shock collar. Obviously, your Professional Dog Trainer consultant is from the Cesar Milan school of dog training (he likes shock collars). Just because the dog trainer you consulted has been in the business for 15 yrs doesn’t make him right. I suggest you find someone who has trained more recently and is up to date with humane ideas about how to deal with problem behaviour. Shock collars are a NO NO for a puppy or, in my opinion, any dog.
Find yourself a responsible dog trainer that uses positive reinforcement methods or better still, go back to the shelter that you got your pup from and ask their advice or for their recommendation for a responsible dog trainer. Your puppy may have been maltreated before you got her – this may be the reason for her behaviour. She needs your understanding, love and patience and looking at other ways in which to change her behaviour – NOT using violence. Your dog is not a criminal and shouldn’t be treated as such.

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