
trays are fine with kibble/mixer added, my Mums dachsie who had a liver shunt as a pup has lived on that combination twice a day and was 10 in May, she had to stay on as low a protein diet as possible and she has maintained a good weight since.
I had the fussy dog problem with my first dachsie when he was an only dog, would eat the samples I would send for then refuse it when I bought a bag, a colleague at works dog was fed for months on his rejects, I then started on ASDA trays with kibble and he ate that great till there was a fire at the tray manufacturers and ASDA stopped doing it, then he went on to Natures Menu pouches, shortly afterwards I got another dachsie and being fussy went or his dinner got eaten by his companion, I eventually started free feeding kibble and had no problems as everyone could eat when they fancied.