Okay so I did the math for my product and this is how it turns out.
Keep in mind that I do not have tax where I live so I do not need to include it.

APROX 15 treats is 1/2lb 3.16
45 treats is 1 lb 6.76
63 treats is 1 1/2lb 8.92
97 treats is 2lbs 13.00

Should I round them to
3.25
6.75
9.00
13.00

or
3.50
7.00
9.00
13.00

I am not sure which direction i should do with this, i want the numbers to seem solid and good but apeal to the customer so please help thanks!!!

Are those the prices it costs you to make the treats? If this is the case, your prices are far to low. If you have included your expected profit percentage, be sure you know what your federal taxes are going to be (capitol gain and such). but as far as those prices, I would go with the first set of rounded numbers.

yeah thats i already did that and i dont have taxes again as a mentioned i was just wondering what set of numbers i should go with, thanks so much for your opinion

3.50
7.00
9.00
13.00
Those are your original 2nd set.

I think that this would be better (evenly spread out looks logical)

3.50
7.00
10.00
13.00

All approx 3 dollars apart