Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
Based on what you report I am concerned about Fern. Constipation is not common in dogs, although can occur and most often does when a dog ingested something sandy-like or if there is an organ problem causing dehydration (liver or kidney issue) or elevated calcium problem. Due to her reduction in appetite in combination with not defecating, it is possible she is not constipated but just not eliminating since she is not eating well (these two go hand-in-hand). If you do see small rock-like stools, then she is definitely constipated. Since she seems to be not eating well and losing weight, my absolute best recommendation is to have her veterinarian examine her right away, and then do some lab work (CBC, chemistry profile, urine check, thyroid check) to look for an obvious underlying issue.
In the meantime, you should try encouraging her to drink and tempting her to eat. Here are a few recommendations to try:
1) Feed a bland diet: Try white rice and boiled chicken breasts (chopped) in about 3 meals per day. If she is having rock-like stools add in about 1 Tablespoonful of canned pumpkin to add fiber.
2) Give famotidine 20 mg at 1 tablet every 12 hours for nausea/vomit. You should be able to find this medication at any pharmacy over-the-counter. It has no bad side effects and does a great job to settle stomach acid and reduce nausea.
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