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Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 16 years of experience. I look forward to working with you.
How frustrating if you plan to breed her. Unfortunately, there is not anything you can feed her to get her to come into heat. There is nothing over-the-counter that you can do. She may be one of our dogs who has "silent heats" where she actually does cycle but has no discharge. Or, she is not cycling. Some larger breed dogs may not come into heat even the first time until she is 30 months of age as a "normal." If you want to breed her, then it is time to reach out to your veterinarian or ask your veterinarian to refer you to speak with a reproductive specialist. Generally, we start the search to figure out what is going on by screening her for endocrine issues, especially low thyroid that might be causing this. If her lab work is great, then some imaging is usually done on the ovaries/uterus (ultrasound) to search for problems. If nothing is found and she seems to be anatomically correct with no underlying medical problems your vet can perhaps help you stimulate her to come into heat using drug therapy (hormones), but this is not something you can do yourself at home. This is a very carefully timed treatment that must be regulated by a veterinarian.
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