So you got a 45 lb. sled dog full of energy.
Pitbull type breeds have been bred for pulling and they will pull loads of over 4000 lbs.
Just look up dog pulling contest on youtube and you'll see what I'm talking about.
The funny thing is that these extra wide collars should really be worn by dogs with ultra-sensitive necks and not much strength. I have one like that on my whippets so that when they run into a Flexi-Leash at 35 mph they don't break their necks.
In your case I would recommend a head halter (Gentle Leader or Halti) if you can find a professional trainer who will help you fit it and teach your dog how to walk in it. The other option is a front-pull harness, Premier is a good brand, where the leash is attached to a D-ring on the dog's chest. When the dog pulls the harness will limit the range of motion of the front legs thereby forcing the dog to slow down. Both these options are kind to the dog if properly used and adjusted. Both ca be found at good pet stores (not the box-store type like Petco) or online.
In the meantime, a moderately narrow collar, maybe 3/4 inch would already make things easier. Also, using a very short leash, usually referred to as a city leash or traffic leash (2-3 foot long) is easier to hold in one hand while running.
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