the time and early split written in form guides depends on the form guide. some print the overall time for the winning dog and some print the actual time each dog ran. generally time differences are 1 length equals .07 of a second so it is easy to adjust to see what a dog would have run if its not given in your form eg if a winning dog runs 30.00 and the dog you're looking at get beat 10 lengths (10 x 0.07 = 0.7) so your dog has run 30.70 (this can adjust if the dogs was weakening or coming home)

early splits on the other hand are entirely different and hopefully in the future form guides will look at this as it is a major indicator in greyhounds. the thing is a lot of tracks dont have the technology to record first splits for each dog just the lead dog (metro tracs like wenty, albion, sandown, meadows however do) yet too often you find forms that dont have first split times. suprising since it is a very high percentage of greyhounds who lead that win.

your question of weight is exactly as moe says. the actual weight of the dog you can disregard on all basis except one. a 40kg dog and a 23kg bitch race to the first turn together and bump. who do u think wins the bumping duel? 40% its the inside dog, 10% its the outside, 20% its the bigger dog, 20% its the more determined/bigger heart, 5% its the smaller dog and 5% they bump enough that the dog running third gets inside or outside them to take the lead.

the weight variation is the key. many greyhound websites that have career stats for a dog will display this. generally a dog has a set (natural) racing weight. the rules are a dog cannot vary more than a kilo between starts and no more than two kilos between starts one month apart. generally in a career you will see a dog range between 1-1.5kg either side of its natural weight with little impact on its performance. yet weight variations when changing trainers can be significant. i have know leading trainer tony brett to add or take off anywhere up to 3 kilos on a dog and improve its performance immeasurably.

i would suggest looking at thedogs.com.au or grv.org.au they are the official websites for New South Wales and Vic greyhound racing. (the dogs requires free registration) they have very good form for meetings as well as indepth career stats, thedogs.com.au in particular