Perhaps this behavior has nothing to do with your dog's heat cycle, or the fact that she has not yet had a litter of puppies. Maybe she just really loved that particular toy?! I have seen plenty of dogs pick a favourite toy that they carry with them all of the time. I know of a Bichon that carries different toys depending on her mood e.g. if she is really exicted she favors one particular toy, and if she is feeling down she will carry around another toy. If your dog was starting to stress out when separated from her toy, then it's probably a good thing that you removed it. Maybe she just needs to have lots of toys to choose from, and then she might not be as likely to favor a particular one?
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