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. I apologize no expert has jumped into answer your question yet.
I am not sure for Jasper I could link a change in diet to lethargy. I can certainly link it to refusal to eat (food preference or aversion) or even if he had digestive tract symptoms (vomit, diarrhea, nausea, not eating
). Lethargy usually points to something more serious. Now, if he has progressed to show you vomit/diarrhea then this possibly could be related to a food change.
We need to determine if he is in an emergency situation. If you can, please take his temperature at home (this must be done via rectum) and if this is higher than 102.5F, then he has a fever and should be seen today. If he does develop vomit/diarrhea especially if profuse or bloody, then he should be seen. Or if he has abdomen/stomach
pain when you gently press, his gums are white/yellow or dry/sticky to the touch (indicates dehydration) or he has progression of the lethargy (worsening to refusal to do anything), then I do not recommend do a wait-and-see approach, but have him seen on emergency.
Unfortunately his signs are vague and I cannot diagnose what exactly is wrong with him. This would require an exam followed by some testing that might include lab work (CBC, chemistry profile, urine check) to get a general idea of what is going on.
If he seems to be better now and no longer as lethargic but refusing to eat, you can always try to offer some bland food such as white rice and boiled chicken
breast (or replace the chicken with cottage cheese). This should not upset his system and might be exciting enough to get him going today and then touch base with your veterinarian tomorrow.
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