This is one of those reads where the sentence structure is basic and in parts very repetitive, but quite a few advanced words are used – “advanced” only because they’re not used often in casual conversation, like parts of an animal (hooves, horns, etc.) So beginners, you can give this a go if you’re feeling very patient but you’ll be looking up every other word in some paragraphs even though you will be able to predict generally what the next few sentences are about.
I wanted to post a quick comment about the words 一箭一般, because this looks like a typical four-character idiom, but it’s actually two separate words, 一箭 (an arrow) and 一般 (like, as if). Together this means “like an arrow”, or in context of this sentence “to take off (running) like a shot”.
There’s also the phrase 从草丛中闪出. We’re talking here about a dog that is “[darting] out in a flash” (闪出) “from the middle of a cluster of grasses” (从草丛中). We can imagine a dog charging out of a field of tall grass and into a clearing.