There are many dog treats and some treats may taste different. It really depends what dog it is. Like for example if you feed your dog the wrong food maybe it will start to bark because he/she is not used to eating food like that. The treats can also be different colors. They can also be different shapes. Like in bone shapes and like dog shapes. It is really hard to find the right one for your dog. Because your dog could like one that you passed all ready and you bought one that he/she did not like.