DOG BUGGY

​I was thinking of buying a dog buggy, but I haven't decided which one is the best.

(but can not put at the front of the sentence)
One day when I browsed the Internet, I found out that there is an exhibition for pet industries will be held in Tokyo.
It is called Interpets 2016.
I though it was a good opportunity to see and try some buggies for my dog.
I went there last Sunday. There were so many people.
Of course I could have those dog buggies a try and moreover, I could get a lot of food samples from the exhibition as well.

I am not sure with the grammar but I think this will be better. Best wishes.

DOG BUGGY

​I was thinking of buying a dog buggy. But I haven't decided which one is the best.
One day when I was browsing on the Internet, I learned that an exhibition for pet industries was going to take place in Tokyo.
It is called Interpets 2016.
I though it was a good opportunity to see and try some buggies for my dog.
I went there last Sunday. There were so many people.
Of course I could test drive a few buggies and got a lot of food samples.

=> Lucky dog! :)

DOG BUGGY

​I was thinking of buying a dog buggy. But I haven't decided which baggy is the best.
One day when I browsed the Internet, I knew found out that an exhibition for pet industries will be held in Tokyo.
It is called Interpets 2016.
I thought it was a good opportunity to see and try some buggies for my dog.
I went there last Sunday. There were so many people.
Of course I had test drive buggies and got a lot of food samples.   I managed to test some of the strollers and got a lot of food samples from the event. (This sounds more natural)

Although I can guess what "dog baggy" might means, “Pet Strollers" or "Dog Strollers" are much more natural in my opinion.