At one year, I'd be very surprised if she hasn't gone into heat already. If she is producing milk, she could be going through what they call a "false pregnancy", when the bitch hasn't been mated, but her body still produces all the pregnancy hormones as if she were pregnant. If she hasn't gone into heat yet, (or if she did go into heat but it was around 6 months of age) she will be going into heat soon. See if you can find a low-cost clinic near you, ask any local humane societies and spca's if they can direct you to low-cost services. It really should be done asap.
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