Share to: It is our eyes that are capable of detecting a portion of the electromagnetic (EM) spectrum called visible light, or the optical spectrum.We describe the different frequencie â¦ s by color, with red being the lowest of the frequencies we can see.t is our eyes that are capable of detecting a portion of the electromagnetic (EM) spectrum called visible light, or the optical spectrum.
Young dogs can react unpredictably to electric dog fences, so understanding a puppy's development is essential to deciding when to start training the animal with the fence and collar. Generally, puppies should not be introduced to electric dog fences until they're at least four or five months old.
There is no limit as to how many collars can be used with a containment system. [ Back to Top ] How old should my dog be before I start him on a containment system? You can begin flag training a puppy at 4 months or older. Wait to start stimulation training until your puppy is at least 6 months old.