My sheltie is usually timid but friendly after she knows a person. The paper boy is another story. She goes wild when he puts the paper in the door. Her hair stands up, she barks viciously and if she gets out accidently during the procedure she circles him at a distance but her tail is wagging. I'm sure they have never had a confrontation and he is not afraid of her. I have offered to put a mailbox outside for the paper and he insists that she's okay and knows she won't bite. I want to stop her from doing this though. I have tried water spray and the coins in a can to no avail. When I take the paper out of the door she lunges at it to bite the paper.
Any suggestions would be appreciated.
Lori
My sheltie is usually timid but friendly after she knows a person. The paper boy is another story. She goes ... take the paper out of the door she lunges at it to bite the paper. Any suggestions would be appreciated.

Lori, there are various ways to get your sheltie to more or less behave well when mail and/or papers are being dropped through the slot, provided you're willing to put in the time (and you're home most of the time to reinforce her training). Yes, this will take a lot of time and a lot help from your friends (who will be needed to act like paperboys, mailmen, etc), because this has already become a strongly reinforced behavior. But why go through all that if you don't really have to?
IMO, the much better, and much smarter, approach would be to simply MANAGE this problem, because it's so easy to do. That is, by ignoring your paper boy's advice and going ahead and putting a mailbox outside for papers, etc., and even removing/sealing the slot in your door altogether.
And you can prevent her from getting out when you don't want her to get out by working on her "sit" command. And especially with distractions.
If she's got a bulletproof sit, and then you command her to sit whenever you open the door, she can't get out, can she?

And as far as preventing her (a sheltie!) from barking altogether?

Good luck with that! Emotion: smile
Anyway, that's my opinion and I'm stickin' to it.

Handsome Jack Morrison
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You have some good advice Jack and thank you. The problem is that she is outside while all this barking is going. There is no slot. When she is inside she doesn't hear the boy put the paper in the porch. Occasionally she has been in the porch and managed to sneak out as he is putting the paper in but has agreed to not let her out when I talked to him this morning. She is doing her sheltie herding thing because she is nudging him along up the sidewalk and when he leaves it's all over. She doesn't try to follow him and when he is halfway out the driveway she stops.
I have good control of the "sit" command when it's just her and I but outside is another story. That needs a lot of work yet. When I open the door I tell her to "stay back" which she is very good at but obviously it's not bulletproof when the paper is being delivered.
I can keep her inside until after the paper has been delivered but that's just a bandage. "I" want to be in control.
And as far as preventing her (a sheltie!) from barking altogether? Good luck with that! Emotion: smile

It's coming slow but sure. A few months ago she barked at anybody that came and would continue to bark after they entered the house but I have curbed that behavior. That was unacceptable.

Lori
I have good control of the "sit" command when it's just her and I but outside is another story. That ... her inside until after the paper has been delivered but that's just a bandage. "I" want to be in control.

How about giving the paper boy one of her treats and having him make her "sit" for it? Most delivery people in my area carry dog treats but I'd prefer that they used one of mine rather than those oversized, nasty colored things they have sometimes.
I'd also work on her "sit" command outside and at random times everywhere. When our dogs were learning - and even now if I expect to be in a hectic environment with them - I always have a few pieces of dry kibble in my pocket. If they start to get overstimulated, we do a few sits and downs until they settle a little.
~~Judy