My hypothyroid dog threw up white mucus. Could it be megaesophagus?

Question

My retriever mix was recently dx with hypothyroidism & put on Thyrosine (1/day) & Cimetidine (2/day). I only gave her 1 Cimetidine yesterday. Last night she brought up some white mucous-y stuff & may have vomited/regurgitated. She kept going out and eating grass, whining, & licking her lips. Appetite is fine & she’s acting OK so far today but I’m worried the hypo could’ve caused ME. Vet said to bring her in Monday if she gets sick again but I’m going to worry all weekend. Thoughts? Pet's info: Dog | Mixed Breed Large (61lb +) | Female | spayed | 6 years and 8 months old | 78 lbs

Sara Farmer, DVM · Accepted Answer

With regurgitation secondary to megaesophagus dogs usually can’t keep any solid food down and continually regurgitate shortly after eating. I would guess that the episode is unrelated to hypothyroidism or the medications- although I’m not entirely sure why cimetidine was prescribed. It is also very rare for hypothyroidism to cause megaesophagus. The good news is that if megaesophagus does occur secondary to hypothyroidism supplementation with thyroid hormone should reverse the disease.

My hypothyroid dog threw up white mucus. Could it be megaesophagus?

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