A resounding Too BL***** right it can. Thanks Phil!
I had problems with keeping weight on my Afghan and whilst they should be more on the slim side he was bordering skinny. His groomers is also a feed supplier who told he his normal diet of Chicken mince/tripe and mixer was not sufficient enough for him and I was never going to put weight on him until I changed. He recommended I switch to Burns complete (which I thought would make life easier as well as my other 2 were on a complete food) Now here comes the stupid bit and yes with Hindsight maybe alarms should of started to ring but I went from approx £6 per week to feed him to a 15KG bag just costing under £40.
The change in him happened over an approx 6 week period, he went from an aloof arrogant whatsit to a complete nightmare. Examples were if I was preparing food in the kitchen and wanted to get him out he would just sit there, touch his collar and he growled. I won't say I was bitten as such but was caught by a warning snap after I refused to back off from his warning growl (Boy if he had gone for me properly those jaws of his would of made rather a mess of me) Needless to say I was at my wits end with him and also having a child knew something had to be done. His attitude whenever food was around both human or food was to put it blunty EVIL. His breeders recommended having him pts but my attitude was to at least try get to the bottom of it. We booked in for one to training sessions and I also had a visit from a fantastic Afghan owner living not too far from me. Only then did things fall into place we the change in temprement coinciding with the change in diet. The vets could find nothing medically wrong and also suggested I take him off burns as they were convinced the protein level was too high for him. This we did and slowly put him back on his old diet, to help with the weight he was fed Pasta and Sardines for breakfast. Within 4 weeks the trainer noticed a remarkable improvement in not only his weight but also his general mood. The Burns was ovbivoulsy just not right for him and being quite a nervous dog anway any food he was being given was constantly being burned up in nervous energy thereby making him lose even more weight. This is turn was sending his stress levels through the roof.
That was approx Nov last yr and now he is back to the aloof arrogant wotsit

However last week my westie got out into the garden with him (they hate each other with a passion) and I walked straight up to my Affie who was snarling and growling, grabbed him by the collar and walked calmly back into the house with him (something beleive me I would not of attempted 5 months ago) I would NEVER of beleived that a change in diet could do so much damage but I came very close to having him PTS because he was making the whole family scared of him. Now if anyone like sales reps try to talk me into switching him onto another food I just say "Sure but you can introduce it to him in your home and I'll have him back in 8 weeks :D