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1) How much does he weigh at this time? 2) Is stool normal? 3) Does he show any signs of illness? 4) Was any treatment given for the mycoplasma?
At 7 months, if he is 8.5 pounds he is actually larger than an average cat at this age. Until 7-10 months of age, we expect kittens to grow at a rate of 1 pound per month of age. Thus, a 4 pound kitten would be roughly 4 months old, 6 pounds would be 6 months, etc. Based on this alone, I would say your companion is likely slowing down weight gain at a natural weight. Does he appear at all thin? emaciated? Is he of purebred origin where one might expect his adult size to be larger than average?Mycoplasma is typically well treated with antibiotics. If the whole household was treated at the same time, you may not be dealing with mycoplasma this time. However, more common than mycoplasma are the herpes and calici viruses which commonly cause URI symptoms of watery eyes, coughing, nasal discharge, oral inflammation, etc. Has your vet discussed starting lysine therapy for them?