Personally, I think 5 months is way too young for an ecollar. I'd highly recommend putting in more time and effort reinforcing your dog for coming to you vs blowing you off for other people or animals. Once your pup is older, an ecollar might make more sense, but right now, too young.
Murdock, BH - GSD
Virgil, CGC - GSD
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Tara, Reagan, Madison, and Jefferson - Aussies