If you ever plan to make anything serious with it, yes, it is highly unrealistic and inapprotiate. Spakle characters and evil human enemy are the biggest clitches that can be done in animal story.
Also, your story doesn't seem to make any sense:
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It is a tale about a cat and a dog that get married and have kids.
Um... yeah. Alredy spoke my mind about it.
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they are always being hunted down by the evil evil kimberly.
Why Kimberly is evil? Because she is human? What is her purpose to "chase them"? Who is she? What is her relationship and reason? Give your villains some depth, reasons and brain too.
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when wolfine was young , he never thought that he would fall in love. he fell in love with a cat named sarafina.
Um? So what? This is the whole story? I can see absolutely no plot here. Nothing is explained. Who are those characters? What are their personalities, dreams, fears, plans? How do they change through the story? What are they doing through the whole story? What are their adventures?
See,
nothing is explained. I can see no story nor character developement in the description you gave.
You'll grow up - you'll se how bad this idea was. I facepalm a lot of my old creation too but too bad no one gave me a crit to show me how stupid my ideas were.