do you think the wet food could cause a behaviour change?Yup,there could be something in the Burns that your dog reacts too.Just like with kids,some ingredients,preservatives etc. send them loopy

(i hope i understood your question correctly)
As burns is a complete food would it be wrong to give him a tin of chappie in the morning and his usual burns in the evening?Do whatever feels right and what your dog does best on,as they are both 'touted' as 'complete' foods than you cant go far wrong. IMO canned/wet foods are a healthier and more natural diet for dogs than dry over processed kibble,FWIW it's a myth that canned foods produce bad teeth and kibble keeps them clean.All dogs should get raw meaty bones,or dental chews etc. to help keep their teeth and gums in tip top condition no matter what their main food source is.
If you need good solid nutrition advice seek out a vet who has done that extra diploma OR a holistic vet who specialises in this field.
My
old vet gasped when he found out i gave my dogs rmb's,he insisted they should be cooked first

He also said i should be feeding them science plan,when i asked why would i want to feed my dogs peanut hulls,fillers by-products etc. instead of a holistic kibble and fresh foods he couldnt come up with an intelligent answer,other than it has been designed by veterinary scientists(so it must be good),not to worry that they also make soap products,shampoo's etc, :rolleyes: not that much different to pet foods,right

.Vets can be brainwashed by the big companies who fund and supply the reading material and give their little talks on nutrition in vet school just as easily as the average pet owner :) It's just that they are in a high position of trust and you really,really want to believe they know best and advise what IS right for your dog,but unfortunately they do not have an endless supply of knowledge in their heads and can not possible know everything that a dog needs.A seperate nutrition diploma takes another 4 years on top of their normal vet schooling to complete,this is obviously how long it takes for them to be well versed in this ONE subject,it would be
impossible for them to learn about this adequatly in vet school when they have all the other "more important" things to study,such as treating and diagnosing disease,most of which can be sucessfully treated with approriate nutrition,rather than the quick fix/cover up of steroids antibiotics etc..Which of these would be easier for a vet to prescribe,do you think ;)
A few years ago i had the privilege of sitting in on one of their nutrition seminar's and i admit they were good,very good, and 'nearly' convinced me into believing their speels!! Most vets have a particular interest in one field or another,a vet who chooses nutrition as his main interest is a Rare gem indeed :(